Hi there!
Thanks for getting in touch with us. Let me help you troubleshoot that issue.
I tried to reproduce the same in my own local installation but couldn’t.
Could you please go to your wp-admin and while editing a venue see if the latitude and longitude fields are filled in? You can discover those fields by clicking the ‘Use latitude + longitude’ checkbox.
If they show up empty, then please try saving the venue again with the ‘Use latitude + longitude’ option unchecked, and see if the coordinates get filled in.
Please, let me know about that.
Thanks,
Brendan