You might want to stick a MIDI monitor between the OT and vBeats, and maybe try running your pattern at a lower tempo to see exactly what’s going on under the hood. This will give you more insight & confidence about exactly what the OT is sending.
Also one very annoying thing about the OT’s MIDI is that when you lock CCs on the same track/trigs that you’re sending notes on, the CCs are sent -after- each note. This may be affecting how the volca handles the messages. If that is the case, one workaround might be to put the CC locks on a lower channel than the notes. For example, CCs on track 1 and notes on track 2.