Thank you so much for the quick reply! I’m happy to help you isolate the problem.
As requested, I set up a separate duplicate site and upgraded it to Sydney 2.63. The url of this new site is https://debug.breganasher.com/. The original site at https://breganasher.com/ is still running 2.56 and can be used for comparison.
Let me know if there is any other information I can provide that will help.