Cannot remove deleted messages

Cannot remove deleted messages from Network Solutions IMAP account. When deleted emails accumulate to over 300, they start appearing in my inbox, again, as unopened emails. So, prior opened emails from the Deleted folder, appear in my Inbox as unopened emails, without provocation.
Have tried “Reset Cache”, reduces the number of deleted messages to O, but moves most of them into the IN Box as unopened emails, just to be deleted again

Gmail account works as it should.

Mailspring 1.9.2, iMac 10.13.6

I occasionally see deleted (or otherwise filed) emails reappear in my inbox, but nothing like this.

Yes, its very annoying. Im going to contact my email provider, Network Solutions to see if they can assist. As I mentioned, my Gmail account work fine, no issues with deleted mail.

Do not forget to upvote your own bug