I'm sorry for the trouble. In order for those themes to appear with the panel background image lined up with your monitor, Display Customizations > Expand Background to Window actually has to be turned off. The themes were designed before the option to expand the background existed, so when it's on it causes them to not look ideal visually. This is something I need to remedy in a future update of the program and the affected themes, especially since this option is on by default, and I appreciate you bringing it to my attention.