The attached screenshot of the my-account page with the default theme shows the functionality I am looking for without the bugs described above. So this is very much a theme issue.
I think you are being deliberately obstructive. You have made no attempt to help resolve the last number of issues I’ve raised even when provided with additional information. I therefore ask that you pass this query on to another team member who is more willing to help.
I have paid for this theme which included 6 months’ support, so I expect you to fulfil your end of the bargain. I really don’t understand your approach.