Bug with barrier

I think there’s a bug with barrier, and I’ve noticed it with while I’m playing a cleric with “creatures start with a barrier at 50% of their max life” perk. Even if my creatures generate a larger barrier after this, the barrier maxes out at 50% of their life. The barrier needs to be completely removed for the new barrier to reach a higher amount than this. I am using traits which raise maxhp of my creatures at the start of turn, so this may be what is causing the bug in conjuncture with starting with a barrier. In addition, all the barriers besides the starting one are being generated using the cleric’s overheal = barrier perk.