Door Locks Jamming

[Galdo76]

Here's my issue. I have a 67 C10. I purchased a new door lock set, latches, and striker plates from LMC. The door closes fine, I can lock and unlock it from the inside and outside just fine. The problem is, if either door is locked and I push in the door handle button from the outside, the door pops open partially and the latch jams up. I found out by accident when I was putting the door back together and had to use quite a bit of force on the latch rod to unlock it.

It would be a nice security feature but unfortunately, if a crook tried to pop the door and can't get in, well then, neither will I.

I was under the impression that if the door was locked and someone pushed in the door handle button to try to open the door, it would just press in freely and nothing would happen until the door was unlocked. Am I missing something other than my sanity?