Can't access my public sites from inside my home network

This is my first post, so I hope I explain myself well enough for someone to help me!

I have a registered domain for some services I host on my home network. It has worked for years and recently stopped working. I've made a few changes (probably too many changes at the same time!) and now can't figure out what happened!

I have been using a Reyee E5 router and port forwarded port 80 and 443 to my docker instance of Nginx Proxy Manager on my Unraid server. I also have PiHole (2 instances) running on other machines running Proxmox that does a decent job of stopping ads.

I thought I was having trouble with my Reyee E5 router so I bought a new Reyee E6. I found the problem on my network that had nothing to do with my E5, so I left the E6 in the box. Last weekend, I decided to install the E6, and now am having all kinds of problems!

I can't access any of the sites with their domain names (ie cloud.mydomain.com) from within my home network, but when I go somewhere else, I can get to the site just fine! I at first thought it was Nextcloud that was causing the problem, but I have other services that do the same thing. I've tried offloading the DHCP to PiHole with no improvement. I took PiHole out of the equation by turning it off and configuring the E6 to use Google for DNS with no improvement.

Does this situation sound familiar to anyone? Anyone have any idea what it could be? I would hate to have to put my E5 back in, but that's my next move unless someone has an idea that would help!!

Thanks in advance for any ideas!!