My turtle won't lay egg(s) on sand after it's done mating.

My turtle won't lay egg(s) after it's done mating with my other turtle. I have two turtles near my house and I've been trying to get one of them to lay egg(s). I've placed them in a huge turtle house with sand on the surface but I just can't get them to lay egg(s). I've fed both of them sea grass but it just doesn't work. I've also made a big pond in the turtle house so that the baby turtles can swim into it. I've also tried this with another turtle but it's just the same. I tried it on another device and it worked. But I can't get it to work on this device. I really want to have a baby turtle and the scute that it drops when it has grown. I really hate this glitch and I want it fix. I hope this will be fixed in the next update.