The configs keep persisting in shortcuts even after uninstalling.
Distro: KUbuntu
I decided to uninstall the script by using the script that was on the readme, but even after that the configs for quarter still appears in the system settings. I looked for any files that may still be around but couldnt find any.

Hello! Yes, this is unfortunately out of my control and also causing issues when renaming the shortcuts. All of the shortcuts can be found inside a KWin configuration file under ~/.config folder. I do not remember the exact name of the file, nor do I have access to a KDE machine to confirm this, but I think it's something like kglobalshortcutsrc or khotkeysrc.
indeed the filename was kglobalshortcutsrc. i have deleted it from there, but i think i might have to restart my machine to confirm that it is all gone. thanks for your reply :)
That'll also delete all of your other custom shortcuts (KWin and KDE). You can just open the file with a text editor and remove everything starting with Quarter:.
Yes that is what i did lol.