Thanks for the reply Brogan.
Here is my admin log for one of the warning that replicated many times over (report system abuse):
You can see they were all created within two minutes of each other. I didn't make six of them obviously, just the one.
I've clicked on them all and taken a look at the request state and I can't tell the difference between any of them, they all appear to be identical to one another with the exception of the time they were created.
Here is a video of my issue of not being able to delete some warnings. Some of them are default warnings and some of them are custom made warnings that are now no longer deletable or editable.
In case you couldn't tell in the video I am clicking the red cross and selecting the delete warning button, and as you can see, nothing happens. Not even an error message explaining why it wont delete it.
Hopefully this information can help some and we can try and get to the bottom of this issue.
As I have explained before. The only thing I have done to the site so far that isn't stock/default is a small add-on that adds a online/offline button to a users profile, which is disabled currently, and some info in extra.css that changes the theme (colours, border positions and sizes etc). None of which as far as I can tell should affect the warning system.
Thanks.