The Play Store often screws up with reporting purchases when you have multiple account on your device and this has been a known issue since 2014. Several long running bugs on the issue have been made private on Google's bug tracker to stop us moaning devs adding any more moaning about it. Clearly they are unable to resolve it or don't think reporting purchases accurately is important!
If there are ever problems like this that get in a pro users way you can always message me at
support@macrodroid.com and I'm happy to provide a serial code to unlock the pro version manually where the Play Store is problematic.