Admin date order doesn't work

Hi, Great plugin!
After I added more than 100 placemarks I start to lose overview. Especially because the time order of the placemarks in the admin panel doesn’t seems to work. I only see an alphabetical list. Is this normal? Is there a way to filter my placemark on publish date?
Thanks

http://ww.wp.xz.cn/plugins/basic-google-maps-placemarks/