Sea turtle egg won't hatch even after 4-5 ingame days

I've been breeding sea turtles more than 5 times, and for all of those eggs resulted from the breeding haven't hatched up until now, and even after 4-5 ingame days on each tries, the eggs still wouldn't hatched. This has been an issue since 3 to 4 realtime days. If this issue has been resolved, than thank you for replying this report