That does sound frustrating.
I hope that not many others experience this bug. If they do, I hope they'll post here to help us get to the bottom of it.
June, can you offer more details? When you say you click what you thought would confirm the merge, what button did you click? What sort of computer and web browser are you using? Does this happen with every merge, or just some?
If you give more information, Jamie will attempt to find the pattern. If we can isolate the problem we can fix it.