Text Input Field Size

I have create a form on my website.

Everything looks fine from my server. The text input fields are all in the right size and everything is aligned correctly.

However, when I open the form from my other computer, I see things differently, the text input fields are not all in the same size. Some of them longer than others.

The font type on the command button looks weird too.

Here is a part of the form:
<Form Name="PostMessage" Form Action = "Post.asp" Method="Post">
<Input Type="hidden" Name="pubdate" value="<%=Date()%>">
<Center>
<Table>

<TR>
<TD><Font Face="Arial" Size="3"><b>Name:</b></Font><BR></TD>
<TD><Input Type="password" Name="vpw" Size="40"><BR></TD>
</TR>

</Table>
</Center>
<br>
<Center>
<Input Type = "submit" Value="submit">
<Input Type = "reset" Value="clear">

Can anyone tell me what's going on?

Different browsers have their own defaults (width, padding, etc) for various HTML tags. However, you can control pretty much every minute detail using CSS. I'd highly recommend you look into CSS, as you wont be able to get away with using the font tag for much longer.