hello again guys are girls!

just a quick query really, when i press the "lock doors" button on the drivers console all doors lock and the little black things go down, then curiously the passenger door pops back up again.

If i lock the car using the key on the drivers door, they all go down and stay down.

any idea what might be causing the passenger door to pop back up?

I have exactly the same thing on my VRS, thought it maybe just a loose wire or something but didnt want to start delving into taking doors apart etc. locks just fine from the door or remote key fob do dar but on the panic button the passenger door ping's unlocked again after about a second or so:(