ok I found out the problem, now if you have a google account setup for something else, the market uses it as one of its accounts.
ie..
I dont have a youtube account for myself, I just use the one my wife made, under her email address, but xoom stores it as an account, well, now that email address is showing up under "accounts" in my market and defaulting to it when I open market... this is now happening on my phone also....this is really inconvient.