question re: payments

I was pleasantly surprised to see a book I'd published through Lulu 4 years ago sold another copy early last month.  I was wondering about the time-frame of payments, though-  if I recall correctly, all sales in the past were paid around the 17th of the next month, but the payment schedule on this sale says June 29th.  
Could someone tell me when/why the payment schedule changed?  

Thank you.  


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