There is an occasional Yahoo glitch where you will make a transaction or change, hit the submit tab, and then get taken to the home page rather than your team page. If that happens, your move did not go through and you must repeat the process. Doesn't happen often, thankfully, but it's something you have to watch out for.
It's also why you should always double check your roster once your move is completed. It's just like counting your change at the 7-11. Always make sure.