One of the biggest mistakes people make is the "They are new so they are perfect and not the problem" mistake. You have to look at EVERYTHING. First off, were they acting this way with the old latches? Well if they weren't then you do have to think about too.
Swing the door in until the latch just touches the striker. Look at the relationship of the door to the cab while you stand back away from the cab at arms length. Look at the relationship of the cab and door and with your hand push the door shut, it doesn't even have to latch completely, just push it shut. As the door moves that last inch or so as the latch passes thru the striker, does the door go up or down at the back? Look at it close, it is often difficult to see this. Look at it in relation to the cab at a body line usually is the best place. Stare at that body line as you push the door shut and see if it goes up or down. If it is, then you need to move the striker up or down so it isn't forcing the door to move, thus BINDING the latch against the striker. Of course, the right thing could be to move the door up or down at the back because the striker is in the perfect place for door alignment. But I am just trying to get across the concept right now. The concept that the striker and latch could be binding.