Why don't my turtles swim back to their home beach?

When breeding, the turtle tries to return to its home beach to lay the eggs.

The special case you are describing (being still) can happen if the home beach is not available anymore or the turtle failed to find a path to it.

If they are hopping into the water, they might try to return to their home beach.

Check the following:

• Is it possible that the home beach was destroyed, e.g. by you removing the blocks?
• Did the breeding actually take place? The turtle carrying the eggs appears bigger than the other.
• If after breeding they hop into the ocean, follow them in a boat - they might be returning to their home beach.