Only 10 map markers visible

Hi,

I bought Web 2.0 directory, and everything is working fine except for the map markers.
There are only 10 map markers visible on the map, while there are more listings.
When I do it this way:
[webdirectory-map num=”-1″], or [webdirectory-map map_markers_is_limit=”0″], that all doesn’t help.

When I enable clusters of map markers in my settings. There appear some clusters, with a number in it, and some individual markers, when I count them, it’s the right amount, but when I zoom in on a cluster of two, I have to zoom in all the way and then one marker appears, not two.

Could you help me out please?

Thanks and kind regards,
Debby