I've had similar issues. I made an instacart order on Sat. night that I selected a 9a->11a Sunday AM window for. I was unexpectedly kept up until 5am due to a personal emergency, and I was unable to adjust the window later, so I was woken up by the delivery at 9a sharp. (and actually by the incessant notifications at 8a sharp).

I've also often wished for a "cancel the entire order if you don't have this item" button. Especially when shopping for a specific recipe where if one ingredient is missing, the rest are useless.