That looks much like what happens, when Fldigi is not initially set for the correct CW WPM speed for the incoming signal, but eventually figures it out for itself.
Check the two figures in boxes bottom left of the main window when in CW mode while it's printing garbage, and then gets sensible.? One you can set, the other it what it finds for itself.
73.
Dave G0WBX.
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Created on and sent from a Unix like PC running and using open source software:
