Thanks guys for your help! but I'm having two problems in IOS know. I checked them in the Hype Reflect and happens the same.
1- This Drag and Drop makes the circle go back to its original position if the answer is wrong (If you don't drag in the correct answer). But in iPad and iPhone sometimes it does, and sometimes it doesn't.
2- The first time you drag in a wrong place, it goes back to the original position, but if you touch again this circle, it goes to another position that it's not where the finger is. It's like it doesn't recognize where the finger is.