so I came across this account that practically has only limiteds in their inventory. Not too quirky there since I have heard of this before. What made it weird was that fact that they have quite a large amount of some hats that all seem to have the same ID. This may simply be due to a website bug or else they appear to have a lot of duplicate hats (i posted a few pics in the spoiler). I’m not sure what’s going on so I just thought I would let you know 
Link to profile: rbxtrade - Roblox
I believe that this is actually a malfunction. I checked my own items, and the serial numbers they displayed in the inventory page were incorrect.
Adding onto what Programmix said, it displays the ID of the item that is up for sale, not the one they own. Don’t know who thought it was a good idea, or if it’s just a mistake, but it’s really odd.
I moved this to a more applicable category. This is a known issue but this does seem to be more than would be expected. It’s being looked into.
Thread moved.
I believe that this is actually a malfunction. I checked my own items, and the serial numbers they displayed in the inventory page were incorrect.
Just to provide more information: it shows the ID of the item that is the first seller of the item, not the ones they (or you) own
Yeah, I noticed this today. It shows the ID of the cheapest selling item no the ID the player has.