Hi,
I don’t know, it’s something specific to the site. My guess would be that may be related to either caching or the theme.
Caching plugins can interfere with JavaScript execution, and most themes remove shortcodes from excerpts so there wouldn’t be any maps at all.
You can narrow this down by doing these steps and checking the maps again after each one:
1. Deactivate ALL other plugins
2. Deactivate any caching (plugins or hosting service)
3. Switch to a standard theme like 2020 (for a moment)