Hello @Snuffy
Thank you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. Generally with opening balances it sounds like you may have another one added. As long as you have an actual opening balance set up at the start of your register. I would recommend trying to save a backup then deleting the opening balance just in case you're not sure if it's set up properly.
https://www.quicken.com/support/how-backup-or-restore-your-quicken-data
Once you get the chance let us know if you were able to get your register to be updates correctly.
Thanks,
Quicken Francisco