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False IQ signal

Hi,

i have two nRF52833 program for make AOA. One is programe as Tx with "direction_finding_connectionless_tx" and one is program as receiver with "direction_finding_connectionless_rx" that i have modified to print IQ data link with an antenna array (of 4 antenna) : 

All compile well and the antenna swicthing works well too but i have a problem with IQ signal.

When i put my tx on the left of the antenna array (side of ant 1) i trace the IQ data that i receive and it's not coherent:

Indeed, the IQ signal of the ant4 and 3 is in advance compare to the IQ signal of ant1 an i don't understand why

Do you have an idea ?

Please i really need help so if you can help me i'm more than interested :)

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