I just did some more testing in DrumsXD via virtual midi to Cubasis.
Definitely seems it’s related to how close together the notes are played. Occasional crash on cymbal is okay but try and do a drum roll or a couple of close cymbal crashes etc., and the length of the note bar in the editor extends forever 
Is there anyone else experiencing this? If so, please post. I don’t think it’s related to hardware or virtual midi apps but it would be goood to eliminate that. Just try some fast staccato notes on whatever you use and check the note lengths in the editor.
I really want to get this sorted. I’ve got a workaround where I record in Beatmaker and then import into Cubasis which works well, but obviously it would be far better to be able to record the midi in Cubasis directly.
Rob