@blake-ellington,
Simply the "Allow embedding for guests" option was disabled and you're checking as a guest on mobile:
We've enabled the option, please check it. It works fine now.
Try on incognito mode if you're checking on mobile devices. Because mobile browsers have a hard cache, you'll not be able to see the change immediately.
Also, we see you've done some customization in the wpDiscuz plugin codes. Please read this doc:
https://wpdiscuz.com/docs/wpdiscuz-7/customization/custom-template-and-style/
Here is explained the update safe way for the customization.