Groups page in ACP logs user out of ACP every time.

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Hi all!

I recently made a change to a group that adds a span format to add the sparkle effect which most people know. After saving this it forces all ACP users to log out of the ACP. We managed to delete the group in question but it continues.
This only happens on the ACP Groups page and no other page in the front-end or ACP.

I have tried the following
- Remove the group
- Clearing the cache
- Different browsers, accounts, devices etc.

The gif below shows this.


I'm really lost on why and how to fix this.

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