Google Map Markers Not Showing up on MOBILE only

Hello, I have worked with betheme on a few sites. I encountered an issue with custom map markers not appearing on mobile devices.
They appear perfect on desktop though. They also appear perfect when using Firefox 59.0.2 in Responsive Mode, but on an actual
iphone 10 they do not show up.

http://dev.gtllp.com/contact-us/

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