As mods leave this site, they are providing links to Modrinth or their own websites. And since you're redirecting the links through your own redirection service, that you've either removed, renamed, or just plain broke, it instead points towards a service that DOES NOT EXIST, and instead you get an Error 404 page.
This was fixed I believe, and please for reporting issues contact support next time :]
https://support.curseforge.com/en/support/tickets/new
for game or mod suggestions go to our discord
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