I noticed this just before the recent site problems but life distracted me from reporting it sooner. I have 2 slots in my inventory in tab 2 that are blank. For example when I receive an item in game it will never be put in those spots but I can manually move something there. When I move an item there the blank space moves to the spot where the item was previously. I took a few screen shots to hopefully give a little more of an idea to what I am talking about.

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This happens sometimes when using philters on pets - it leaves a ghost spot.

You can use the trash can icon to remove the ghost spots from your Inventory.

I tried removing it via the trash like you said. Nothing changed, also I never have philters in that tab it's mostly orbs and avatar items. No big deal though I'm pretty used to it. Just thought it was strange. Thanks :)

Which slots are the items currently in? I will check the database and see what they are.

Currently they are in the same slots as in the last picture.