Actually I started playing with this again I discovered how to reproduce it. It doesn't happen when I drag an item from the chest or drag an item to the chest. It only happens when I double click on an item in a chest to move it to my inventory. When I do that, its like a snap shot of the item gets glued to the middle of my screen. And the more items I move by double clicking on them the more that are in the snap shot.
Hope this makes sense, just trying to help.
By the way great game and loving it a bunch
Magirus40k