Structure in Structure problem - data disappearring

I have a problem that really makes no sense to me. As part of a schedule creation program, i have a structure created for a league, which has an array of team structures which has a schedule structure for each team.

Here are the structures:

///////////////////////////////////////
// //
// Team Schedule Constructor //
// //
///////////////////////////////////////
struct teamSchedule {
int opposition_ID;
int day;
int date;
int month;
int year;
};
///////////////////////////////////////
// //
// Team Array Constructor //
// //
///////////////////////////////////////
struct teamRecord {
int team_ID;
string team_Conference;
string team_Home;
string team_Name;
teamSchedule mySchedule[82];
};
///////////////////////////////////////
// //
// League Constructor //
// //
///////////////////////////////////////
struct leagueRecord {
int leagueNumber;
int season_ID;
string seasonName;
string currentDate;
string leagueName;
string draftDate;
string playoffDate;
string scheduleDate;
teamRecord teams[30];
};

Now I made a 'displayTeamInfo()' function so I could check that all the data gets in there (the part im most concerned about it is the team_ID 's for comparison). Then I made a function to initialise the schedule so that the schedules data is set to 0 for the opposition_ID.

But after the schedule is initialised, somehow the team_ID is then set to 0????(I run displayTeamInfo again) There appears no way that this should be set back to 0 by this function. This is the function:

int clearTeamSchedules(leagueRecord &myLeague)
{
for (int i = 0; i < 30; i++)
{
for (int x = 0; x <= 82; x++)
{
myLeague.teams[i].mySchedule[x].opposition_ID = 0;
}
}
return 0;
}

Somehow myLeague.teams[teamnum].team_ID is being reset to 0 by this function. It makes no sense:

myLeague.teams[teamnum].team_ID
myLeague.teams[teamnum].mySchedule[arraynum].opposition_ID

are nothing similar. There is no other code causing this. The call to the routines is like this:

displayTeamInfo(myLeague);
clearTeamSchedules(myLeague);
displayTeamInfo(myLeague);

And the output goes like this:

---------------------------
Team Info for League 1
---------------------------
Team_Id | Team_Conference
---------------------------
1 1
2 1
3 1
4 1
5 1
6 2
7 2
8 1
9 2
10 2
11 1
12 2
13 2
14 2
15 1
16 1
17 2
18 1
19 2
20 1
21 1
22 1
23 2
24 2
25 2
26 2
27 2
28 1
29 2
30 1
---------------------------

---------------------------
Team Info for League 1
---------------------------
Team_Id | Team_Conference
---------------------------
1 1
0 1
0 1
0 1
0 1
0 2
0 2
0 1
0 2
0 2
0 1
0 2
0 2
0 2
0 1
0 1
0 2
0 1
0 2
0 1
0 1
0 1
0 2
0 2
0 2
0 2
0 2
0 1
0 2
0 1
---------------------------

I don't see all of your code (specifically how the data is intialized in the first place) but this line looks suspect:

Change it to:

My guess is that you are running off the ends of your array and that is what is causing your problem.