DW1000 transmitting out of bandwidth

Dear friends, I found strange behavior of my tags. I found they are continuously transmitting out of range of

bandwidth. When channel 5 is selected, and TC_PGDELAY is set as mentioned by users manual, it transmitting from 4,7GHz to 7,7GHz. When channel 2 is selected, it transmitting from approx 2GHz to 6GHz. What am I set wrong? Any suggestion? Regards, Petr