Hi Helena,
the way you structured your db doesn’t really align with the way those dynamic page are designed to behave.
instead of setting the different categories in different columns in your collection, we call this structure ‘Dynamic category’ once you migrate to this structure it will result in cleaner collection, less pages and easier to add new categories.
please follow those examples:
https://www.wix.com/code/home/video-database
good luck!
Shlomi