You're likely using another 3rd party Mega Module for JomSocial events. That's not our module, but we first heard a report of the issue you mention about a month ago in the post below:
www.sourcecoast.com/forums/jfbconnect/jf...figuring-jfb-connect
That thread will describe the issue more. I'm not sure if that user contacted the developer, but they never responded, which could mean the developer was able to fix it for them.
Please contact the Mega Module developer and see if they can help narrow down what's going on there. If they are able to, please report back here as we'd love to hear the resolution.
Thanks,
Alex