@TrishaMeyer1 ...
Yes...even if you removed the module, all the content that was in that module would still be available on the "Pages", "Discussions", "Quizzes", and "Assignments" index pages. The "Modules" page is just the area to build all the content from those other areas of your course. Still...this sounds pretty strange. By chance, is the course set up as a blueprint course? Or, was the course shared to Commons and so there might be a "master" that was changed and then pushed out to the course in question? Just trying to rule out some other possibilities.
I still think a call to Canvas Support would be a great idea here. Keep us posted!