Inconsistent Design on Windows Desktop Apps

I can't stand it.

The last examples are Wunderlist and Skitch. Both changed their UI and now they look out of place. This is more remarkable when you're using a dark desktop theme, and those white windows are distracting.



Why they do this on Windows, with apps clearly designed for OS X?

It's because Microsoft don't even respect their guidelines (Visual Studio 2012, Office 2013)?

What do you think?