Hi,
It sounds like a similar problem to mine... I only bought mine a few days ago and the seller told me about this issue so I was aware of it. What happens is that when you unlock the car with the fob, the drivers door knob doesn't pop up. If you insert the key and turn it, it does pop up. Having said that when you get out and shut the door and then press the fob, the drivers locking knob does go down and it locks.
Any ideas...?