Returned resistance skill points bug.
The old resistance point bug is back. Where if you already maxed out resistance, then your unit levels again, you can use the new points to increase resistance again above its max. So you should only be able to put 5 points in it, but if you level up again, you can put a 6th point in each resist, it takes your point and increases the resist, then turns grey. It only lasts till the end of that battle though, and then your point is just gone.
This bug was fixed ages ago, back in the starting months of the game, but this last patch seems to have brough it back. =/