GL-MT300N-V2 2.26 radio settings power not adjustable

I cannot adjust the power on radio settings in my GL-MT300N-V2 with 2.26 firmware. It gets always back to zero (0), buts emits 100%. Has anybody this problem? the same with firmware 2.272. I do not want to go to newer firmware, because of vpn issues.

Plerase advise
thank you

Sorry I have no idea. But 2.272 will not be supported and have bug fix.