softlocked at boss 10
I don't understand why 2 factories with same update levels do not produce the same stats for units.
I also encountered that. Leveling the stats in a different order seems to cause it when the X of the X.Y version numbers increases in between somewhere. The values seem to reset and sync up when the battle is won (don't know lost/reset?) The firerate was different also and was about to get a screenshot of those when the battle was won, when I checked them again they were the same. Any stat whose +value grows with increase of the main level of the category is likely affected by this.

If you level up one thing 20 times, then another 20 times but do it differently for the next factory within the same battle, you'll see that the first-upgraded stat is lower than the other factory.