can't get back to main voobly account after making a spare account?

i made a secondary voobly account and signed in to the client with it. now, when i sign out and sign back into my original account, i am nonetheless still playing with the secondary. i can't get back to the original account. When I open Medieval Siege, I am still in my secondary account, even though in the Friends list window I am signed in as my original account. It's so weird. What's wrong?