My account is registered in the same timezone as my own so no issues there but when i see the dates on when my sold items need to be sent by they vary from being needed to be sent within 1-3 days despite all of them are set to have a 1 buisness day handling time.

For example one of my items were sold at 9am but does not need to be sent till 2 days after that day where as an item sold after or before that one needs to be sent within one day it is very random when they need to be send by and this is my theory on why some of them maybe flagged as late shipment which is very annoying.