High levels of LO Leakage

[booth]

Dear All,
I am using LIMESUITE with the self_test.ini file and disabled the Ch.B loopback.
High level of LO leakage is observed on both channels. What should I do to get rid of the spike? Here is the observed spectrum:

[Edgar]

@booth What should I do to get rid of the spike? in the High level of LO leakage.