Door locks only when open and on 1st latch

[BlouDon]

I've never been able to lock the driver's door believing the problem to be a poorly installed after market central locking actuator.

Today I removed that and found:
1) Locking works fine when the door is open;
2) Locking works fine when on the first latch;
3) Does not want to lock when on the 2nd latch.

I've oiled everything and everywhere and I've adjusted the pillar catch. No lock luck.

Is there a known issue that could be causing my problem?