Hi guys,I have a problem,to me it's a big one but could be a small problem to you.
When I move the pitch,in the receiver tab,it moves along with the yaw,,,,what could be the problem??

Go to the receiver tab in inav configurator and check the channel mapping order:

It should look similar to AETR1234 or TEAR1234, this is the order of the channels.  You polly need to match the order of channels on the flight controller with what is setup on your TX.

I assume you mean that when applying movement on the pitch stick you are seeing BOTH the pitch and yaw channel bars moving at the same time. If so, are they both showing exactly the same values when they move?

Go to the CHANNEL MONITOR page on your transmitter and check if the bars on that are behaving the same with both the pitch and yaw channels. If you are then the issue will be with the configuration of the model on your transmitter. Go to the INPUTS and MIXES pages for the model to ensure that you haven't inadvertently applied some kind of funky channel mix for the pitch channel which is resulting in values being output on both the pitch and yaw channels.