Unable to save / save and close / cancel from editing a landing page

Your software
My Mautic version is: v4.2.2
My PHP version is:
My Database type and version is:

Your problem
My problem is:
Unable to save / save and close / cancel from editing a landing page - specifically the newest landing pages. Older ones this seems to work fine but maybe the four most recent ones aren’t allowing me to save / save and close / or cancel. When I select one of those options the buttons grey out and my cursor turns into a no symbol when I mouse over them and nothing happens. The changes aren’t saved and I have to select components - landing pages to exit the screen. The same thing happens when I try to make new landing pages.

(I’ll have to ask my boss about the PHP version and database type / version sorry!)

These errors are showing in the log: none

Steps I have tried to fix the problem:
I’ve tried logging out and back in, using a different browser, clearing browser cache and cookies, trying on my laptop, trying on my phone on chrome and safari, restarted computer, turned off windows defender firewall, restarted router, signed in on a different user account and none of it has worked.