I actually purchased the U2410, used, on eBay, as I had read it was 100% compatible with the Amiga (I read somewhere the U2412M does not display all 15KHz resolutions), and am now slightly disappointed to witness this behaviour on PIP

I also have a Dell 2001FP and every time it starts, on full screen VGA, the behaviour is similar - screen moved to the left. But in that case, as it's full screen, I can adjust it properly (although it becomes painful doing it on every reboot)