My Centurion will sometimes skip his turn -- bar fills twice before he moves.

I thought at first he had some status effect keeping him from moving but then I realized it would just happen with no status effect on him.  I've only run him in Kaerok Castle so far but it doesn't seem to happen at the same place either.  Just today it happened in Stage 3 round  3, then (on replay) Stage 3 round 2, and Stage 4 round 1.

It's possible that it is status effects not displaying correctly but I do not think so as he hadn't even been attacked when he just stood there while his bar filled and re-filled.