Cursor way off when using the zoom function

I am working on creating a big huge map (400x400) for a sandbox game and I zoomed all the way out so that I could quickly and easily drop big huge tiles of landmasses, but when I went to zoom in to work on the details it freaked out on me, lost visibility on a bunch of tiles (though I can tell they're still there just can't see them) and then when I zoomed back out my cursor was selecting things way off to the right and below me. I've never worked on a map this big before and maybe I'm just missing something obvious.

Hello Sam. are you using the in roll20 zoom or browser zoom? Can you supply a screen shot or two of what is happening?

I'm guessing the map is scrolling out of view. It happens to all my large maps. Try zooming back in, and making sure to stop scrolling with the mouse before you hit the edge of the map. Still a pretty bad bug IMO.