1939 pickup Door Latch

[Fech]

Please advise: what could be the reason that the passenger door latch mechanism opens from outside even though it is locked inside? See the attached pictures.

 

[petehoovie]

Please advise: what could be the reason that the passenger door latch mechanism opens from outside even though it is locked inside? See the attached pictures.

 

[Fech]

I found the issue. It was the latch sliding plate with incorrect bevel.