Daugther does it all the time
My daughter walks on her tip toes, but can walk normal just fine. It is something she just likes to do. In fact not only does she walk on her tip toes she walks on her toes like a ballerina. Not sure where she learned to do it, but she finds it funny. I'm am not worried about it and she will probably grow out of it eventually. I reminder when we are out and about to "walk on your feet, not your toes" lol.