I hosted my DisplayMap.php script on a WEB site to display a Google Map with a specific latitude / longitude / zoom, supplied as parameters:

All my computers are set with a display resolution of 1920 X 1080 with a scale factor of 100%. On all computers, I open a maximized Google Chrome window, so the display area must contain a viewport with a similar size. On all computers, I paste the following URL to call my script:

http://quadgen.ca/QuadGenMap.php?v=H&x=-72.02156&y=48.57706&z=11

I am expecting a similar result on both computers. On 99% of the computers, I get the "Correct.png" image where the entire lake St-Jean can be seen.

On a few computers (same screen resolution, same scale factor), I get an "Incorrect.png" image which looks more zoomed in that what I was getting on most computers. What can I do to fix this?

Resulting images