I guess the left corner of the windshield is hidden behind the rollbar, that's why it looks wrong. I tried to draw some perspective lines on your wip here. They should have been either paralell or preferably they should meet a mile to the left of the picture. I guess it's obvious they won't 
It's gonna be easy to fix, but normally it is a challenge to combine two cars from totally different perspectives.

Uploaded with good intentions

It's gonna be easy to fix, but normally it is a challenge to combine two cars from totally different perspectives.

Uploaded with good intentions