Headlight motor issue

Hi guys, I am having an issue with the headlight motor on the left,. I have replaced the diodes in both motors. But hasn’t solved my issue. The lights pop up as normal but the one on the left drops a couple of cm once it’s popped up and then when they’re turned off the lights drop as normal but the one on the left pops up again couple of cm. now I haven’t checked any fuses or anything but I presume if there was a fuse issue that the motors wouldn’t work at all, also there’s ca low battery. Thanks

Sound to me that the mechanical connection between the headlamp and its motor is out of adjustment.

It's a while since I did mine so don't recall the exact mechanism but there is an eccentric with a crank pin on the motor and an adjustable link going to the headlamp which I expect will be a couple of degrees out , thus the lift motor stops with the lights a couple of centimeters out whether its up or down.
You get at the mechanism by undoing the dzus fastener on the panel behind the headlamp under the bonnet.

Here's a scan of the diagram in the Haynes manual