I carefully considered your spectra and I want to give advice (recommendation)
Try scanning with parameters:
SRmin = 100
SRmax = 6000
NF = 1.5dB
And do not forget, after the end of the scan, double-click on 21563800 and 21607000 kHz, and then Save - Paint - Save
Here are some pictures.
1. Spectrum in TBS6983 Mode - Before Feed Reports
2. Double Click on 21563800 - "Before Paint & Save"
3. Double Click on 21607000 - Before "Paint & Save"
4. Spectrum After "Paint & Save"