“ReOrder Post Within Categories” Plugin dysfunctional after WP 5.0 Install

I downloaded Health Check and did the troubleshooting with it due to a “Nothing Found” Page on one of my category pages. On the first use, Health Check pinpointed the problem for me. Once I disabled the “ReOrder Post Within Categories” plugin, my site worked fine. All other plugins were clean (I checked just in case). I believe this has only been happening since the install of WordPress 5.0. I wanted to let the Health Check volunteers know about this plugin problem. If this isn’t the right place to do that, just let me know where to move my post.
More details: I have multiple category pages on my site, and all were working except one. Here is my site currently, in its fully functional state: https://www.sanfrancisco.wayfary.com/
So the homepage was fine, all the menu links (which go to category pages), all the links to articles on the homepage, and all the links to articles in the footer worked fine. The only problem was the “Getting Around” menu link. When clicked on from the site, it was showing “Nothing Found” message. From my dashboard, when I tried to view (view, not edit) the individual articles from the Posts menu, I got the same “Nothing Found” message on all articles except one (I believe this was because the one functioning article in this category happened to be linked elsewhere on the sites homepage, while the others were not).
Anyway, I ran Health Check, and it seems to be fixed. It would be ideal to be able to use my re-ordering plugin, but for now its deactivation is better than having an entire category missing.