CapsMan stuck on 30dbm

Hello People
I have a strange problem with my RB Metal 2SHPn. While on the site they say it can transmit with 32dbm when i connect it as CapsMan it goes max 30dbm. The coverage is weaker when i put the antenna in Capsman mode than when i use it as a simple Ap Bridge. I have noticed it also with an SXT SXTG-2HnD. From the CapsMan configuration i have inserted options no_country_set and tx power 32 but still max 30dbm. Any ideas?

Still haven’t figure why is stuck to 30dbm. Anyone else ?