Sometimes WP themes or page builders render MapSVG shortcode twice, which leads to issues. You may see the following error in the browser console:
Failed to execute 'getComputedStyle' on Window
To fix the issue add the no_double_render parameter to MapSVG shortcode:
[mapsvg id="123" no_double_render="true"]
If the solution above doesn't help, please open browser's console, go to the "Sources" tab, press CMD + P @mac / Ctrl+P @win and enter "mapsvg" in the search box. If you don't see MapSVG JS files it means that the files are merged into a large single JS file by a caching plugin. You need to open the caching plugin settings and exlude MapSVG from it. Also find the settings that extract JS code from the page body and disable that too. Or disable the whole page with the map from being cached.