I ran into an issue with my latest character.
If I move the character on it’s main ctrl, there are a few faces moving incorrectly with the character.
It looks like some points are delayed in their movement. They move, but with less weight.
It looks as if you have a few points which are not weighted correctly. You can use the weight manager to work out A) which points need to be fixed, and B) which bones they should be weighted to.