There is a generic remote feeding the transport. Same events all through.
Mapped to Device->Transport->JogRight ,N.
It has been around for a long-time. I think it was OK in cubase 8 but I have not that installed any more.
You have the input on the midi monitor. They are all a jogright event, still the transport locator is moving left.
That I think happen is a race, one jog-event is not completely processed when next starts. And under some
circumstances the last part of the event is processed after next. Eg that part that moves the transport locator. But
that is a theory, the problem is that i gives random behaviour.