That's very odd! I suspect it is some styling interfering with the tile images the Google map is composed off. I inspected the page but I couldn't spot where that was happening, but you could likely confirm if that is the case by switching to another theme and re-checking, and if that doesn't confirm it, try de-activating all the non-Toolset plugins temporarily.
I don't know how you set up the map to work with dynamic sources; it would probably help if we could take a look at your site to see what you have done.
Let me mark your next reply as private so that we can get log-in credentials from you—you may want to create a temporary admin user for us to use that you can later delete. And be sure to have a current backup of your site.
Can you give more details about what you are trying to set with dynamic sources?
If you face any difficulty in creating this view, please share the link to the page where you're working with it and I'll suggest the next steps, accordingly.