Hey, i just saw a bug now, you can reproduce like that. On mobile:
1- Click on one category in the header
2 - Click on one post in the category and Scroll at the end
3 - Click on the same category on the header
All the category header will disappear. I just tryed it on my forum and on the demo
EDIT:
it’s the same if you go to a category and refresh( f5) the page. All category will disappear.
EDIT:
Is there any fix for it? Thanks