problem with one AP on capsman

I'm having a problem with one AP, model WAPG-5HaxD2HaxD, connected via capsman. With the same profile settings, the other two allow the client to connect at higher speeds, but this one only allows a maximum of 100 Mbps (the others give around 380 Mbps). What could be the problem? Is there something wrong with the radio? All are updated to 7.23.3. Thanks for the tips, because I'm out of ideas.

I'd blame CapsMan LAST and start looking for potential frequency conflicts. And "same profile settings" or the exact same config?

Swap units around and see whether the problem stays with the unit or with the location