Meowch! This is something new, indeed. At least, it has never happened before.
Perhaps it's a funny misunderstanding that occurred here.
So please check the picture of it and make sure that the number of points (1) needed for upgrading (2) (below the item) and the level of an item which is shown a bit higher (3), above the picture, wasn't mixed up in your game.
We're sure that the issue will be resolved immediately, but if it's not, we're always glad to assist you - please contact us via the Support button in your game.