Hey @LeafCatcher,
We have found this bug and will hopefully have a fix out within a week or two. In the meantime, closing down the app (by pressing the Xbox button on the controller) and pressing the Start/Menu button on the Gems of War icon, and Close Game, followed by reopening the game again will get the game to connect to the correct profile.
If this is still opening the incorrect profile, Please follow this guide to get the correct profile loading again. Please note you will not lose any game progress by following these steps.