Hi Ana. I ever found a reason to explain the behavior, so yes I think it could be a bug.
It opened correctly on my iPad, but it took 2 restarts to work correctly when I opened it on my phone (using the web player)
This is a cool project. There are definitely some inconsistencies with the first frame of your project that are pretty difficult to track down. How big of a problem is this one? Is anyone able to reproduce in a smaller project?