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this is what I get when trying to delete them.

Also forums not loading

Same.

I came onto Kumos to reply to a forum post (because they weren't loading on the legacy site) and then tried to delete old event notices.

I try to get to all notifications and get "Oops! Something went wrong" page.

Clicking on the Checkmarks by them seems to make them go away. But I'd prefer not to have to delete each individual notification.

Is this on Kumos?

Yes, only on Kumos.

Notifications on the Legacy Site are working correctly.

yes it has been cleared up so far