Update!
I made a post before about marking issues because they kept peeing next to their tunnel all along the side of it. I tried my best to clean it up every time they did but it kept getting worse.
So, I made new arrangements in their pen. Unfortunately I took their beloved tunnel away, but they’ll be able to use it outside of the pen when they start to free roam. I moved one of their litter boxes where the tunnel used to be. I even changed their hay (they weren’t really eating the old hay), and it’s gotten so much better! Still having a few accidents, but they aren’t fixed and are only about 10 weeks old so I assume it’s probably normal.
Pics because they’re so cuddly with each other & I’m gonna be so sad to separate them soon :(