Ok...
So I went through all 121 Units and I believe it may have something to do with stats, but I doubt it.
The results showed that only Merchants, Generals, Beserkers, Vanguards, Wolfssegners, and Great Knights cause problems...
However I was not able to test out the Lodestar, Ballistician, and the Witch Class.
I also noticed that no matter whether their starting class was something else if you reclass them in, or out of the game it will still cause the error.
Here are the Units that caused problems, and the hand written are all the units that worked. (Quality isn't good)
Last picture is just a picture that shows what I used to test it out. (Nothing Special) This is all I was able to discover of the error problem for certain units. Hope it helps.
I will let you know whether the reduce the stat by one solutions works.
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did it work out? i feel the game may mark units with too high of a certain stat or potentially a high stat total exceeding what the game thinks is normal
I doubt the to much of one stat, or the stat total causes the problem.
The Selkie I show is Legal.
The Silas I show does not work.
I don't believe the fact that she holds I beaststone causes prolem either.
It might be worth mentioning to you that all the classes I mentioned have 65-70 Hp, but that probably has nothing to do with it.