1963 Valiant 'vert door latch latch (?) not working

Haven't been on FABO for a looong time (sorry).
Still have my '63 'vert down here in Australia.

I did a search but can't see much in relation to this question, so please bear with me.

I have a problem with the driver's door (LH) not shutting on the striker (weird shaped striker - has teeth on the bottom - totally unlike the Aussie Valiants).
When I pull the door shut from inside the car, or push it shut from outside the car it like, bangs the striker and like, just won't go into it.

I'm thinking that the latch (is that what you blokes call them?) is buggered. The little starwheel thingo does turn with my fingers but seems to jack up on me when I close the door (doesn't like the striker? LOL).

I hope that I'm making sense to someone who knows my problem.
Any offers of helpful advice appreciated, thanks.

ALSO, as a side note. Our Valiants have a different striker so I'm guessing that the '63 US Valiant may have a one year only, or something???? I really don't know.

TIA
Gary