Send to Shared Stash Bug

I have 11 items under the completed tab and I'm trying to send items to my shared stash. I clicked on "Send to Shared Stash" and the button gray's out, but it gets stuck there until I switch tabs and tab back to the "Completed" tab. The item then disappears from the list, but is not sent to my shared stash.

This has happened twice in a row.