Hello!
You may be hitting a bug that was fixed in Q.11.18, where the switch stops emitting GVRP when changing lern mode on a port. Additionally there was a later fix where the switch was sometimes learning VLANs on ports blocked by spanning tree (in Q.11.25).
You may want to load the latest published software version onto the switch: http://h10144.www1.hp.com/customercare/support/software/summarypages/q-j9019-c.htm
The difference between revision A and revision B products usually have to do with manufacturing changes. The software versions will work on all revisions unless specifically mentioned on the software download page. In your case, you will have absolutely no problems updating.
Should the software update not resolve the issue, then I suggest contacting warranty support so the issue can be analysed. It is theoretically possible there is a bug which would need fixing, however it does sound like a configuration issue first hand.
Kind regards,
Michael Olsen