The same problem exists when going to a page archived by someone else. In fact this is my primary use of the site and the problem applies to all the associated archive URLs ( archive.md archive.ph archive.is and others.)
One thing I will point out though is when you show for Brave, it says archive.today closed the connection. When I tried typing that in, it redirected to https://archive.ph/ I’m not sure if you’d have better luck typing in that URL instead?
Yeah, seems like it might be something more related to DNS or something. The sites seem to be working on Brave in general. Really not sure why you’d be having issues. But then when you say that it duplicates in another browser, it kind of doubles down to say it’s not anything with Brave.
Big issue is just troubleshooting where the issue is at.