Thanks for the reply, I would have loved to reproduce it and take screenshots but it's a little inconvenient to repeat as a player, as I have to first bring my troops above lvl 12 for free promotion. However the test set up is simple. Bring any member to lvl 12, then remove the equipment, then promote them between their classes. I think it has to do with the leveling up stat bonus, for example a Knight that is trained since lvl 1 to lvl 10 will have different stats from a Squire or Fighter trained to lvl 10 then promoted to Knight. In my case my Knight rank is 5 and Fighter rank 3, resulting in different stats. Could you provide the details on stats up statistics, the table should clear up the confusion.
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Ah, that's a good point. Each unit's stats are calculated like this: Base Stat + Level Up Stats.
The Base Stat depends on the class and rank of the class (a Knight with class rank 5 will have higher base stats than a Knight of class rank 3, a Fighter with class rank 5 will have certain base stats that are higher (ATK) and certain base stats that are lower (HP, DEF) than a Knight).
The Level Up Stats depend on which class you are when you level up the character - a unit that levels up 10 times as a Squire will have a much lower ATK than a unit that levels up 10 times as a Fighter.
If your Knight is rank 5 and Fighter is rank 3, then there's definitely a base stat difference that will drop the stats.
We'll test it to see if there are any other stat bugs affecting it. Thanks!