I’m on a Lemmy instance (sh.itjust.works) with the standard interface, the link and picture both go to the picture so it looks like it is a problem with Lemmy or Mbin, not just apps. I was able to replicate it in multiple browsers.

Can you try reposting this from your Lemmy account to see if that makes a difference? Given what we’re seeing so far I think it might be an issue on Mbin’s side.