My WebBlocker has been blocking a lot lately. Sites like Lastpass.com, dellsupportcenter.com, update.microsoft.com, and webroot. None of these were ever blocked before. Not sure if this all started with the upgrade to 12.5.1.
It's possible the categories might have changed.
You can compare the category here to what categories you have blocked in your configuration:
If you find a site that's mis-categorized, you can report it at that same page.
WatchGuard Customer Support
I just got another alert. This time its for www.altajan.com. Which is Business and Economy. This is allowed yet I got an alarm (email). Alarms are not configured for this category, just logging. So the category is correct. The traffic log shows it was allowed. But again, I got an alarm email.