If you ever face an issue of your assets not showing in your inventory it is probably because your wallet isn't linked or you've listed an asset as a Smart Contract listing.
When you make a Smart Contract listing, the asset is taken from your wallet and stored inside of a Smart Contract. This allows the asset to be sent instantly unlike the regular escrow service whereby the seller has up to 24 hours to send. You will be able to see the asset under the ‘Listings’ tab on the dashboard and have the option to cancel there and the asset will be returned to your wallet.
If your wallet isn't linked, you can find guides on the knowledge base on how to link them.