BUMP. I just experienced the same issue… seemingly duplicative YOP Poll table entries in mysql db. Potentially when I recently updated the plugin it created this new set of tables. I am presuming there was incompatibility with the prior set, but the DEVELOPER needs to weigh in.
I am curious if I am able to delete out the original wp_yop_ tables and keep the new wp_yop2_ tables (shouldn’t the plug-in have done that? They don’t seem to be hurting anything, but some of us like to maintain a streamlined db. I made a backup of my db and just tested deleting them out and it didn’t seem to affect the plugin data or operation (front or back-end).
But feedback from the DEV would be appreciated…!