I was trying to setup SBUS on my Flight controller (XRacer F3), and found the values on the Receiver tab just jumps around randomly.

I followed the necessarily steps, enabled Serial Receiver in configuration, setup the correct port as Serial RX. 

Tried a different Flight controller and different X4R-SB RX, Still no joy...

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Problem solved:

I forgot to change Serial Receiver provider!!! Changed it to SBUS and it worked beautifully...