The & is the html escape code for an ampersand (&) symbol, which is used to separate query params in a url – it appears like this has been re-encoded so the single & in the URL becomes & by something breaking the link. If you change all of the &s to $ it works. it’s not really an “amp” link in the “Google Amp” meaning.

Also after posting this comment, it appears to be Lenny’s url encoding, I think I’ve fixed it but if not, remove the amp; from the 3 sections of the url you see it and it’ll work

Looks cool, and I’ll definitely check it out once the initial user bug is fixed :)