CMD + Tab from fullscreen app switches to wrong application Sometimes I have a fullscreen app open , say safari. Then I want to switch to Terminal app thats open on the desktop( along with other apps like preview etc). 
When I cmd tab from safari to terminal , the PREVIEW app comes to focus , and its window comes on top. 

I am using macOS sierra 12.1 

Any tips on how to fix this ?
Force quit Preview, since it has a bad habit of running in the background, like text edit and others. Only Terminal, Finder and Safari should only be seen with cmd+tab pressed in full screen view....good luck