The screen capture shows artefacts at the bottom of the image in the far right column. This is independent of the respective device and the recording program used; tinySA also shows the same artefacts. NanoVNA version 1.2.15, the issue existed also with versions 1.0.64 and 1.1.x, also latest tinySA version.
see also
and
Another user's tinySA also shows this, so it is obviously a systematic problem.
/g/tinysa/message/7071Martin