It could be the loud near by signal of the repeater is getting into the SDR as seen here.
Observation 2552848: KAITUO 1B (40912) - I need to make some sat band filters
and also here Observation 2530032: FOX-1A (40967) - Wondering where the interference can be from
I have issues with “near” by repeaters getting into my obs some times and I have started to make a list for myself so that I can try and debunk or protect against it.