Is it only on your mod pages? I had issues with mine (not being able to mass delete hold comments, myself and another player got the login cookie issue on the holds and application page). I made a new page (just copy and pasted over all the html from the first one) and have had some people poking at it and everything seems to be working fine there including the deleting. Maybe try that if it's only on those mod page entries you're running into the issue?