Hey sorry to Hear this. Yes i Made a small little mistake before submitting. I placed the Start Point of the Player on the wrong spot.
we did not encounter any bouncing and Glitching but i do have to say that this is our first game so the Code is not Optimized or well made.
Small Tip once you collect the Coin on the starting Island after about ~2 Seconds A Bridge will Come up making a way to the Big Island without the Jump and Run. As it was intented to do the Jump and Run from the Other side. Im sorry about that. Thank you for your comment!