This is a bug in the Geodashboard with the Search/Download page.

The bug occurs if you try to load the page directly without going to another page first.
Basically, the map does not display any of the markers in this situation.
However, if you go to another page first (like the Explore Page) it does not occur.
GLTG DEV has the bug currently if you want to test with a live example.

For further details, it appears to be an OpenLayers related error.
It is an Assertion Error (number 25): https://openlayers.org/en/v3.20.1/doc/errors/#25
It is happening in the componentDidMount section of BasicMap (can see this when you go to the page after going to another page first)