The report ending on 6/30 was their Annual Report which they have 90 days to file. The report ending on 9/30 is their Quarterly report which they have 45 days to file. Annual report is Audited & the reason they have a longer period to file.
Because the 6/30 report is a year end which you have a longer reporting deadline since it requires an audited statement. The 9/30 is a quarterly report and is released earlier since it will be unaudited.Also i believe in one of his interviews( don't know which one)Cam Battley stated that.