Calendar is displaying events twice

Hi

I have an issue were the calendar is displaying my events twice for a certain month which I believe may be something to do with the grouping?

In the example below I’m expecting only 3 events to be displayed one of the 6th, 7th and 8th of January but a total of 7 are being displayed?

Ant ideas what the issue could be?

Thanks

Below is the JSON used by the calendar

[ {"start_date":"2015-01-06 10:00","end_date":"2015-01-15 10:00","text":"Event Group","id":"EG_5","event_pid":"","event_length":3600,"rec_pattern":"week_1___1,2,3,4,5","rec_type":"week_1___1,2,3,4,5#3","resource":"1","capacity":"10","location":"1","staff":"","description":"Test<br\/>Swimming Pool"}, {"start_date":"2015-01-06 10:00","end_date":"2015-01-06 11:00","text":"Test<br\/>Swimming Pool","id":"E_1426","event_pid":"EG_5","event_length":"1420534800","rec_pattern":"","rec_type":"","resource":"1","capacity":"10","readonly":true,"location":"1","staff":"","description":"Test<br\/>Swimming Pool","title_text":"Test<br\/>Swimming Pool"}, {"start_date":"2015-01-07 10:00","end_date":"2015-01-07 11:00","text":"Test<br\/>Swimming Pool","id":"E_1427","event_pid":"EG_5","event_length":"1420621200","rec_pattern":"","rec_type":"","resource":"1","capacity":"10","readonly":true,"location":"1","staff":"","description":"Test<br\/>Swimming Pool","title_text":"Test<br\/>Swimming Pool"}, {"start_date":"2015-01-08 10:00","end_date":"2015-01-08 11:00","text":"Test<br\/>Swimming Pool","id":"E_1428","event_pid":"EG_5","event_length":"1420707600","rec_pattern":"","rec_type":"","resource":"1","capacity":"10","readonly":true,"location":"1","staff":"","description":"Test<br\/>Swimming Pool","title_text":"Test<br\/>Swimming Pool"} ]


Which timezone you are using on your PC ?

Similar problem can occur if event_length doesn’t point to the valid start time of original events. Please check in js console is new Date(ev.event_length*1000) provides the same date as defined in ev.start_time