I think I actually just figured out the issue, as well as the solution through a lot of testing. The posts disappear from several widgets utilizing them such as sliders and whatnot. Through testing, I have confirmed this happens to me whenever I change the settings (parametres).
I fixed the problem simply by going into the category ordering interface of the plugin, then checking the bubble that says no (non) and rechecking the bubble that says yes (oui). Each category came back online after I did this one by one. Hope that helps anyone else who runs into this issue.
