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If the receiver cannot get lower signals than -90dBm (spec -120dB) you could have "RF desense".

For more information see the link below:

[URL unfurl="true"]https://www.hwe.design/system-testing/system-coexistence/rf-desense[/URL]

Reasons could be: digital noise (coupled conducted and/or radiated), layout, grounding, filtering, etc.

I do have a tinySA which is working fine. Is specified at +/-2dB accuracy but actually it has +/-1dB accuracy. Maybe I was lucky.

Sweep time is a bit slower for wide bandwidth, but for the money is fine..