[Q] Weird Dialer Behaviour.. topic

On my rooted stock Nexus 5 with KitKat 4.4.2 after I make a call the last app I used opens up and I have to exit it. My wife has a different phone also with KitKat 4.4.2 and her phone does the same thing. On both phones if I close all recent apps before I make a call this doesn't happen. So I'm thinking this is a bug in KitKat.

Has anyone else experienced this?

Thanks!