Thanks Jack @GreenSock but i've already done it on the demo because i read about iOS issues , and it improved the navigation a bit. But unfortunetly didn't solved the problem..
Other operations i may do?
@OSUblake i've created the demo fast and i didn't put the right attention on nesting, you right.
Tipically i do nest ScrollTrigger only if i want a specific item to start the animation in a different point of the viewport.. i hope that doesn't still a bad habit! ?