Hi @CarolineRaycher ,
Quick question: have you been using the "assign to" option for these modules?
The reason I ask: whenever I used the student view, there used to be added a 'testcursist' (in Ducht, no idea what i would be called in English) to the course. That one doesn't appear under 'people' anymore, but I do think somewhere under water this testcursist is still added and is not assigned to a specific section. If you assign modules to section, then all other participants op de course will not see those modules. Therefor the student view will also not be able to show the module: it wasn't assigned to this 'fake student'.
I don't work for Instructure, but I think this might be it, at least if you assign modules to students/sections.