Cannot access my lists via bookmarks section

I cannot access my lists of images I created in the fstoppers.com community. After adding a photo to a list via the bookmark tool in the image view, I can add it to a list, create a new one and so on. This is working like expected. But I didn't find a way how to get access to these lists I created previously. I assume the bookmark section in my profile is meant for it, but the section "Bookmarked Media" doesn't show any entries, just "Peter N. has not created any lists."

https://fstoppers.com/profile/207874/bookmarks

Other bookmarks like articles or group post are displayed in the bookmark section. So I'm a little confused here.

I'm using Firefox 63 on Windows.