Well, it seems jensnorr is right.
I have one project with 'Hide open files' OFF and all my other projects had the option ON.
The issue did indeed not present when i turned 'Hide open files' to OFF for all my other projects.
I also noticed that it doesn't fix the issue when you open a project with 'Hide open files' ON, then turn it to OFF.
You have to close the window explicitly with the project and reopen it to negate the bug.