From time to time, I build desktop versions (for Windows and macOS) of my most popular generators for my patrons. The last time I did this about a month ago. Unfortunately, using the same version doesn't guarantee that a map will be restored from its permalink exactly the same (at least for some of the generators). I know it undermines the whole idea - it's a bug to be fixed.
I noticed this recently, It seems to move a very little bit east at least in my case over the few months that I have been observing it. I have in the past wondered if there could be a way to pan the map or increase the view range. In any case, I do love all of these generators from the bottom of my heart.