Defender IP lockout updating data frozen at 100%

Over the weekend, I noticed on several sites that when checking the IP Lockout sub-menu, the program had a popup that said "updating...".

On most of my sites, this update happened and the pop up disappeared, but not on this one.

The site is http://www.mysite.com

I have a couple of users blacklisted and I need to whitelist them. Please note my site is live and I will create a staging environment.