When you use "<" and ">" buttons on Month view to navigate calendar, Google Calendar events are duplicating each time you press the button (so if you do it 4 times you will end up with 5 copies of the same event displayed etc).
There was a similar issue for 7.x, but only when AJAX was disabled. Since, to my knowledge, AJAX isn't supported in 6.x, enabling this option does not resolve the issue.
Closed: outdated
2.0
JavaScript
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Version 6.x of this module is no longer actively supported. Closing out tickets against that version. If this is still an issue in an actively supported version of this module, feel free to re-open and provide steps to reproduce the issue.