Project Web App can't delete PDP despite custom scripting being enabled

Hi everyone,

Currently trying to set up a Project Web App system and I've encountered this problem. When trying to delete/remove a project detail page from a project nothing happens. My organisation has custom scripting enabled and I can remove fields and other stuff from projects but when I try to remove a page it doesn't work. I've removed all fields from the page I'm trying to delete so I don't think its anything to do with a required field or existing workflow, and I get no error message when I try to delete the page. I simply click "Delete Page", stop editing and the page is still there with no change.

Anyone have any ideas on what could be causing the issue?