Some movies are missing from "Movies" section but show in "Collections" section

[theguymadmax]

Do you have "Group movies into collections" enabled in Dashboard -> Display?  If so, turn that off.

Also, a possible culprit. Did you group any library folders? Found in the home menu customization:

Library Folders
Automatically group content from the following folders into views such as 'Movies', 'Music' and 'TV'