Additional information.
If a structure was dismantled, and the server restarted and the previous session save loaded, only a single new structure is recreated. It only creates multiple copies if the structure was not previously dismantled.

My issues have now gone away as I have replaced my GPU. Swapped the Nvidia 3800 with a Radeon 7900xtx. Obviously a very expensive fix, and I can't be sure if it's the hardware upgrade, (24GB VRAM now), or the different vendor.

This is not realistic, and really needs updating. I'm not sure why they made this change at all, when it was working fine before. What was removing this feature supposed to solve?

I think there is a related problem, and raised a ticket for it. Vehicle doors IRL do not stay open once you start driving forwards. In the game they do, leading to the absurd sight of a Huey flying at top speed with both doors wide open. It looks ridiculous and is completely unrealistic.
Realistically, inertia at slow speed and wind resistance at speeds above 15kph would slam the doors shut.
T187836

I have had this problem for a while. Sometimes switching into windowed mode for a minute, then back to full screen fixes it for a bit.

Same issue here.

I have the same issue.
Also, using mousewheel to adjust movement speed has a similar issue, only seems to have walk or run rather than a graduated scale.

This is partially resolved.
Map can be read
Compass can be read
Watch can be read
Torch can be turned on, but only while wearing the torch, so it is pointing directlky forwards and cannot be aimed in the usual manner.
Binoculars still unavailable.

I see this is now resolved.

Confirmed, all fixed now. Thanks.