Question about drivers window?

[Wykesy]

Hi, I have a 2001 Boxster 2.7. I recently had a new window regulator installed on the drivers side. It was installed by a mechanic I know. He's good but not a Porsche specialist. Since then the window still drops when you open the door but only half the distance than before, this means that it catches the roof.

Any ideas what it could be? Or what I need to do to sort it?

The window drops as it should when the catch is undone on the roof. The regulator was not genuine but from a Porsche specialist. I have tried the different sequences for re-setting the windows but it makes no difference. The passenger side behaves as it should!

Any help or advice to get this sorted would be much appreciated.

Thanks

Paul