TX power bug in FW 3.4.3.5-r2

Unable to set 18dBm TX power on radio2 with channel 36 - 48 on FW 3.4.3.5-r2. Country Norway.

Max TX power is 17dBm. If i change channel to ex. 52 it works with 18dBm.
Tested on E400, E500, E410, and E600.