Broken stats upon Lyn mode characters' return

[Sacred Blaze]

I've been having this issue for a while in my hack, but I've had no luck seeing where it's coming from, unfortunately.

So, basically, upon a certain few characters joining the party, their stats will sometimes be raised to a number well above what it should be.

[spoiler=Example]

These two images are from different playthroughs.

As of now, this issue only occurs on four of my characters, the ones in the slots for the non-tutorial versions of Lyn, Wil, Sain and Kent. On the point that they rejoin in the Eliwood mode, their stats may look like this. Apart from the broken ones, their stats, levels and experience have been perfectly translated over from their stats at the end of the Lyn mode.

If I'm remembering correctly, when Lyn mode characters who've survived return in the Eliwood mode, they shouldn't actually get any extra stats anyway.

It seems to be fairly random what stats of characters are affected by this. For example, (See picture above) I've seen Kane's strength be raised, or Andrei's skill and speed be raised. The most common stat that has been affected by this to my knowledge is resistance, but it's not always the case. I have also had playthroughs in which this issue will not occur on any of the characters, but it seems to be most common in affecting at least one of the four characters.

At one point I thought that it might be something in Nightmare that was affecting this.

[spoiler=Nightmare Screens]

The stats in the image above are for the characters in Lyn and Wil's slots. There's nothing particularly strange about the values here that should be doing this, I think.

It should also be noted that none of the four characters are autolevelled, so they have no reason to be gaining extra stats.

One thing I've noticed as well is that if I were to load straight in Eliwood mode, these nightmare base stat bonuses will worked out for the four units just fine and they will never encounter any issues.

I also thought that this might be some kind of Hex issue.

[spoiler=Hex Screen]

So the above screen shows the hex from a part of the Nightmare Character Editor.

The highlighted values are those corresponding to Andrei/Wil's (from Level to Constitution bonus) listed numbers in the said editor. The hex image is taken directly from the ROM file after seeing this glitch, so nothing has been altered yet. His base resistance is the 02 byte. But there's nothing here that seems out of place to me.

Some other things to note:

• These characters do all rejoin together on the same chapter as each other, like they do in the original FE7, although i'm not using the same chapter to do this. As a result I have tried seeing if changing the chapter in which they rejoin would solve the issue, but it didn't.
• This issue can be fixed mid-game, either through editing the nightmare stats of the characters again, or by using codes to change your characters stats, but obviously this isn't ideal and the first solution may actually cause another stat bug later into the game.
• The bug is raising their stats by 31, which is the limit on stats or something, right? I don't really know what I can do about that though.

So, can anyone think of something that might point me in the right direction to seeing where the issue really lies here, or did I just screw my ROM up a long, long time ago and should have realised it back then?

Thanks in advance for any answers.

And please tell me if if I need to provide anymore information or make something more clear.

Edited November 10, 2015 by Sacred Blaze