Hi,
Sorry for the issues you are having.
We get those coordinates from Google directly after sending them the address, however, sometimes Google has issues. Usually it is outside of the U.S., but can happen anywhere.
We are working to integrate a feature to modify the coordinates and hope to have that in an upcoming release.
In the mean time if you check out the Event Rocket:
Event Rocket
It has the ability to modify coordinates if Google and our plugin cannot get it right with the address.
Let me know if you have any follow up questions.
Thanks