hi every one i have a roundy but have a problem i try to lock the car and all i have to do after locking it is push down and up on the door handle and it unlocks itself. or if i lock it from the outside then close the door it baqsically unlocks it self. im stumped how do you fix it or is it haddit need a new one? thanks fellas its passenger door im talking about.

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1964 smooth roof panel van
1967 Mk 1 X-Police cooper s
1970 mini k
1975 leyland