I've had this issue before, only it was occurring when items were moved from the vault into my shop. This time the issue is occurring from items quickstocked into my shop from my inventory.

Attempted to use the fix from the Previous Thread regarding this issue, but it did not work.

Currently using windows 7 and chrome version 63.0.3239.108

Same thing happened to me I was so confused earlier

edit to add: these items were quickstocked from my inventory to a gallery, then when I tried to categorize the items they didn't move. I clicked the link at the top of the page to fix items split between categories and it tried to do something but when I checked the items they weren't categorized. So I tried to categorize them again. They still wouldn't move.

I am having this issue too... I have stuff that is already categorized in a shop, I add more of the same item and it ends up as none instead of in its respective category

I first checked my shop not long after you posted, and it had worked on some of the items that were having issues but not all of them. I figured I would wait a bit to allowed the site to mull it over and check again later.

However upon checking again a few moments ago I'm afraid I still have items that are splitting themselves.

:'D Apologies, I completely misread what you meant by the fix then. I'll need to go hunting through my stocks then. ^^;