About EdCubasero’s test… Sorry, but it seems like your midi is not working correctly.
When I do the same thing, notes are striving to be on the beats… and both on the left and right side of the beats. They are both little late and little early since we’re no machines.
If you have this problem for real you might wanna check system timestamp and stuff. Also you could try and move the file ignoreportfilter ( in the folder midiportenabler in the cubase folder) and place it directly into the cubase folder instead. Then when you open up cubase some more options of available midi inputs will show up with the name “emulated” beside of them, try all of these and try setting system timestamp on and off to see if you get rid of it.