Are you using InventoryGridView?
It needs to be changed within the addon then as the normal icon would be shown right to the item, in the row.
But you are using a mod which changes the item rows to only the icons (which is what InventoryGridView does).
Talk to the author of the addon.
The "problem" is that every new icon will be added to the inventory "row" at a fixed position.
If you disable IGV you'll see the icon is at a column near the sell price, more to the right of the row.
If the adodn does not know the icon before it needs to be changed in order to recoginze this new icon column now, reduce the size and place it at the inventory "icon" of IGV (which is 1 row in the standard game).