Minecart Automatically Let's Me Out

I have a Samsung Galaxy S3 and I had the beta of Minecraft PE when it was 0.13.0 build 2. I had fun yesterday playing with redstone and other stuff that will be added in 0.13.0. What I noticed is that everytime I go into minecart it lets me out. The only way I can get in the minecart is to use the "Ride" interaction button. Please help!