Hi David,
unluckily I bought the same kind of misbehaving tinySA clone from KKmoon via Amazon.
I checked the internals and found out, that they assembled two SAW 1-port resonators (EPCOS R980) instead of
the required SAW filters of the same dimensions. Replacing these should fix the problem, but they are too tiny for
me to handle.
Best regards,
Tom Korte