Just chiming in that I have a similar issue so hoping someone has a solution.
This doesn’t seem to affect the product actually being added to the frontend, however.
Here is a video of the issue with screen capture – happens in Chrome and Safari and have had the issue on 2 different machines.
https://dl.dropboxusercontent.com/u/21638782/AES/BasketIssue.mov
That’s great – I was hoping it was just an intermittent issue happening to me.
