The number of tracks with just a single message is really high. That would suggest you have a lot of noise on the signal into the dongle. What power supply are you using? Also how long is your antenna cable? You would achieve better results if you moved your preamp to the antenna end of your feeder cable.
Edit:
Maybe the single message rate is not that high after all. My main receiver is an Airspy mini and that shows virtually no single messages. However I have just reinstalled graphs on my ProStick receiver and it shows a similar proportion of single messages to yours.
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