Unfortunately, macOS can be unpredictable when it comes to window management on Spaces and external monitors. Third party developers aren’t given access to the macOS APIs needed to get those working correctly yet. We hope they become available soon! As a workaround, we’re developing a Save/Load Layout feature, so even if widgets get mixed up, you’ll be able to quickly restore them. We apologize for the inconvenience though! It’s frustrating to us too.