I have the same issue on a Roland JV-90 without the use of a sustain pedal attached. The issue is coming from the keyboard itself as it sends the additional notes to your DAW in MIDI. Obviously this would be a big issue if trying to play a live performance through a controller.
I’m not too familiar with the settings inside the physical keyboard, but wondering if maybe there is something that needs to be configured internally that is causing this on all Rolands.