How to add more than two Markers in unfolding?

I need to add three markers in unfolding map.addMarkers. It works but it can only draw two markers. When I add the third marker, it only displays the last two markers. I tried to change the order of these three markers and found it only displays last two markers. My ways of loading data for the three markers are the same. And I have already imported the multimarker to my unfolding.

Any help would be appreciated.

Thanks!