The Cruise Planner for my reservation has Day 2 CocoCay Day 4 St Thomas Day 5 St Maarten.
When I look it up as a new cruise, you're right - the port days are different.
But, when you select the sailing day, the next page shows the port schedule is back to the dates that match my Cruise Planner.
I'm sure it's Day 2 Coco Cay Day 4 St Thomas Day 5 St Maarten.