Drivers door central locking issues 300tdi

Hi all sorry if this has already been answered. Ive had a look but everyone elses problem seems different.

I have got a N plate 300tdi discovery. When pressing the keyfob to lock the car all the door locks but then a second later the drivers door pin comes back up and the alarm goes off.

However if i put the key into the drivers door lock and turn the key the car locks perfectly as it should.

I have had the door panel off and cant seen see any obvious signs (broken clips etc)

Any help would be appreciated as i am completely lost with this
Thanks

try readjusting the central locking accuator but may need a new one