Hmmm...I just gave it another test and was able to successfully import 137 entries very quickly without issue. Did you zoom in after you imported? Google Maps does not automatically change the zoom level for you, so if you have, for example, 100 entries in the same city they might look like they are on top of each other. Zooming in would show the differentiation.
How many entries are you attempting to upload?
If you still have an issue, please e-mail your KML file to help@mapalist.com and we will dig into if further.