That seems like a problem with an aftermarket remote entry system. S13s have central locking, and there should only be a switch in the drivers side door and an actuator on the passenger side door. If the driver's side is locking itself then somebody must have installed an actuator
Also, when closing the door from the outside, try locking it and then holding up the handle as you close it. Some Nissans unlock themselves if you don't hold the handle up.
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