Popup doesn’t appear

Link: https://dev.izzysindex.com/
Problem: Popups do not auto-open anywhere on the site.

Hello! I’ve installed Popup Maker on other sites with no issues; however, on this site, it does not seem to want to work. I’ve created the popup, set the trigger to auto-open, and left conditions blank so that it will appear on all pages. What could I be missing?

I’m guessing there is a coding conflict somewhere, but can’t figure out where. I’ve deactivated all plugins (except Popup Maker, of course) and reverted to the 2017 theme, but the popup still doesn’t appear. I’ve also uninstalled/reinstalled Popup Maker, as well as WordPress. Still no luck.

Any advice at all is greatly appreciated.

The page I need help with: [log in to see the link]