I suspect based on your description that perhaps not all of the setup for your pre provision VC was removed before you did this new setup leading to the inconsistent results.
The other item to be aware of is you should set the priority to be lower on member 1 assuming you want to keep mastership on member 0 unless there is a failure. By setting them the same you no longer fully control the election process.
At this point, I would suggest reseting to factory default to start the process again.
request system zeroize
If that is not feasible, you are probably best to open a JTAC offical ticket so an engineer and do a deep dive on the configs and guide you to a less service affecting transition.