Multi monitor annoyance/issue

Bit of an issue with 2 monitors:

Monitor 1 is on start screen, monitor 2 is on desktop. Open an app on Monitor 1 like Store for example and browse around, hit Windows key to go back to start screen. When I click on monitor 2 to do something in an open application, monitor 1 flips back into the previous app automatically, instead of staying on start screen.

I can't imagine this is intended behavior, I left the app and went back to start - why would it restart the app by simply clicking on the second monitor.

Any way to fix this that anyone knows of?

Yes, of course it's the intended behavior. It the same behavior as the Start Menu in previous versions of Windows. If you click somewhere on another monitor, the start menu closes.

The purpose of the start menu is to choose a program and get out of the way. So yes, that's the intended functionality.