Pixhawk 4 and crossfire problems


So I am fiddling on a new project and i found that i cannot connect any thing else ( bluetooth and mini osd) to other telemetry ports on pixhawk while i have the crossfire connected via mavlink and rc control via ch7 and 8

funny enought if i switch of the rc control and only use mavlink the osd and bluetooth works again

the error i am seeing over the osd mini is “overspeed”, but plug out the crossfire and reset the pixhawk and it works

any ideas would be appreciated