AD9371 Rx gain clarified

Hi Sir,

So far, we found the sensitivity =-92dBm while MGC Rx gain 20dB and 30dB during RCT mode is the same. But, in normal mode , the sensitivity under -120dBm RSRP between MGC Rx gain 20dB & 30dB can't get the similar one, detail is as attached. Do you have any comments for that ? Thanks.