Map not working when using more than a low number of markers

[adepablosdb]

Hi, i have implemented gmap on

https://www.rcsport.es/futbol-7/liga-2016/liga-masculina/madrid

We notice that maps works nice using a number of 11 markers, but when we add a new marker, (total 12) then , map does not display ...

We checked browsser console but not error showing, no syntax errors ... no errors in anywhere, just, the map is not shown ...

Now you can see in mentioned url that the map doest not shown

Thanks