Can't save config of new or existing load balancer monitors

I’m trying to configure a load balancer monitor but every time I try to save the settings it fails, with a red message along the bottom saying “interval is not in range [18446744073709551615, 3600]: validation failed. I’ve tried everything, and this happens even when everything is left at the default settings. This was happening both yesterday and today, and happens in Chrome (both normal and incognito mode), Firefox and Edge. Further, it happens with either of the domains I have on Cloudflare.
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