Cannot remove/replace item in inventory

Went into creative mode and stored a bell in my inventory. When I left creative mode the bell will not allow me to drag it, move it, replace it, or discard it.

When I tried to drag an item over the bell in attempt to move or ignore it, it made the item go away.
When I started moving other items, the item I tried to move over it, was BEHIND other inventory slots.

Exited game and refreshed, and the issue did not resolve itself.