Update: I found the setting that was causing only one point to display, so that part was easily fixed. Under Settings -> Reading -> Blog pages show at most: was somehow set to 1 from the beginning (by previous site developer) and I guess it didn't effect the old version the same as in the new. That's better now.
The other problem is still there however. When I switch back to the old theme, when I look at a location post, it shows all the meta information of the Custom Post Options, but on the updated version, all those fields show blank, even though it still seems to apply to the front end content. Any ideas about porting it over? I'm imagining it's something in the SQL table wp_postmeta within the meta_value field, but I don't know what.. Thanks in advance.

Want to note that when I edit the old blog posts, all the meta fields show blank, but when I view the post, it does show on the map. So at least it's still there, it's just not displaying the filled fields. There is hope, I just hope it doesn't involve going through the thousands of posts to correct. Thanks.

Hi there, we had this theme in use since 2013 for our site FindaSpring.com and we just recently update to the latest version mainly because the Google Map API change.. Got the style customized again and set it all up, was mostly happy after the dust settled, however now all the posts with locations are no longer showing the longitude/latitude in the post meta, and we had hundreds over the years, and now a bit worried about losing all that. Did a database backup just in case, and trying to figure out how to convert or recover that info. Also when I go to a blog category, like California, it only shows one pin point when it used to show all of them. We're a little freaked out about the potential of losing all the submissions since that's the foundation of our site.. I hope there's an easy fix, I can give you a WP admin login or the PHPMyAdmin access if that would make it easier. Thanks a lot, looking forward to getting this resolved...