Clarification of mod_rewrite's RewriteRule is needed.

Greetings.
Apache Guru help need.
I ask a clarification for the following.

I'm using the .htaccess in some dir
---==========
RewriteEngine On

RewriteRule ^AAA/(.+)$ BBB/$1 [NC]
RewriteRule ^BBB/(.+)$ CCC/$1 [NC]

RewriteRule ^CCC/(.+).html$ nph-page.php?ps=$1[NC]
---==========

Which accidently rewrites the /AAA/some.html into nph-page.php?ps=some.html/some.html/some

I expect to receive
page.php?ps=some.html
not triple of them

the mod_rewrite.log is
---==========
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add path-info postfix: t:/html/httpdocs/content/aaa -> t:/html/httpdocs/content/aaa/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] strip per-dir prefix: t:/html/httpdocs/content/aaa/index.html -> aaa/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] applying pattern '^AAA/(.+)$' to uri 'aaa/index.html'
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (2) [per-dir t:/html/httpdocs/content/] rewrite aaa/index.html -> BBB/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add per-dir prefix: BBB/index.html -> t:/html/httpdocs/content/BBB/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add path-info postfix: t:/html/httpdocs/content/BBB/index.html -> t:/html/httpdocs/content/BBB/index.html/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] strip per-dir prefix: t:/html/httpdocs/content/BBB/index.html/index.html -> BBB/index.html/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] applying pattern '^BBB/(.+)$' to uri 'BBB/index.html/index.html'
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (2) [per-dir t:/html/httpdocs/content/] rewrite BBB/index.html/index.html -> CCC/index.html/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add per-dir prefix: CCC/index.html/index.html -> t:/html/httpdocs/content/CCC/index.html/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add path-info postfix: t:/html/httpdocs/content/CCC/index.html/index.html -> t:/html/httpdocs/content/CCC/index.html/index.html/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] strip per-dir prefix: t:/html/httpdocs/content/CCC/index.html/index.html/index.html -> CCC/index.html/index.html/index.html
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] applying pattern '^CCC/(.+).html$' to uri 'CCC/index.html/index.html/index.html'
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (2) [per-dir t:/html/httpdocs/content/] rewrite CCC/index.html/index.html/index.html -> nph-page.php?ps=index.html/index.html/index
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) split uri=nph--page.php?ps=index.html/index.html/index -> uri=nph-page.php, args=ps=index.html/index.html/index
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add per-dir prefix: nph-page.php -> t:/html/httpdocs/content/nph-page.php
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (2) [per-dir t:/html/httpdocs/content/] strip document_root prefix: t:/html/httpdocs/content/nph-page.php -> /content/nph-page.php
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (1) [per-dir t:/html/httpdocs/content/] internal redirect with /content/nph-page.php [INTERNAL REDIRECT]
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (3) [per-dir t:/html/httpdocs/content/] strip per-dir prefix: t:/html/httpdocs/content/nph-page.php -> nph-page.php
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (3) [per-dir t:/html/httpdocs/content/] applying pattern '^AAA/(.+)$' to uri 'nph-page.php'
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (3) [per-dir t:/html/httpdocs/content/] strip per-dir prefix: t:/html/httpdocs/content/nph-page.php -> nph-page.php
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (3) [per-dir t:/html/httpdocs/content/] applying pattern '^BBB/(.+)$' to uri 'nph-page.php'
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (3) [per-dir t:/html/httpdocs/content/] strip per-dir prefix: t:/html/httpdocs/content/nph-page.php -> nph-page.php
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (3) [per-dir t:/html/httpdocs/content/] applying pattern '^CCC/(.+).html$' to uri 'nph-page.php'
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e5d38/initial/redir#1] (1) [per-dir t:/html/httpdocs/content/] pass through t:/html/httpdocs/content/nph-page.php
---======

the problem is
127.0.0.1 - - [27/Sep/2005:20:37:21 +0400] [www.domain.com/sid#868d40][rid#25e0398/initial] (3) [per-dir t:/html/httpdocs/content/] add path-info postfix: t:/html/httpdocs/content/BBB/index.html -> t:/html/httpdocs/content/BBB/index.html/index.html

When I add options [L] or [PT] to the rules in .htaccess the problem disappears.

Could anyone clarify me why without [L] or [PT] options Apache works a bit odd from my point of view.

Thanks.