hi:
I also found this problem when i test ad9361 at 2R2T, LVDS, FDD MODE, under 50m sample rate .
AD9361 input signal from signal source,freq 2537MHz,AD9361 rcv lo is 2536MHz.I get rcv signals from ad9361,then anlyse them used by fft.I found the mirror frequency at -1MHz lower 10db,compare to 1MHz.
when i delay q by one sample point,the mirror frequency disappeared.