This issue appears in safe-mode on theme-creator.discourse.org and on my own site, but not on Meta or try.discourse.org. Don’t know if this is a bug or if I’m missing something. Theme Creator is currently on 2.7.0.beta8 and the other three sites on 2.8.0.beta1. So it doesn’t seem to have anything to do with which discourse version the site have.
So here’s the issue. If you first open a large image with lightbox on a mobile device and zoom in (by clicking on the image). And then drag the image (in order to see the rest of it), the image info and arrow moves as well. See images below.
I was able to recreate it on both firefox mobile and safari mobile as well on desktop firefox with responsive design mode. You can test it on this post on Theme Creator.
For comparison, here’s the same image on meta.
Want to clarify how to zoom in on a mobile device when there’s multiple images in a post. Because perhaps you want to test the above when there’s multiple images (like in this post with the Pikachu image). It’s not obvious and I think it’s probably a bug.
First off, the image needs to be big enough in order to zoom in (Pikachu above is big enough ). If you have a single image in a post, you zoom in (on a mobile) by clicking on the image when it’s opened in lightbox. If you do the same in a post that has multiple images (like in this post) it will instead jump to the next image. But, if you start by opening the image before (in lightbox) and then you click on that one, then your will see your image zoomed in.
I hope that wasn’t too confusing.