Yeh, one of the crafting skills prolly; if it's "permanent", the popup is just stuck; eventually you'll have a garbled mess down there, with a stack of different icons and numbers on top of one another...
A screenshot would help, but as mentioned, it's probably just a magazine completion. Sometimes the collection/completion stuff that appears at the bottom right of the screen get messed up and just stay there forever until you reload the save.
