Multitouch touchEvents not triggered as they shoul

Question

I have various touchEvents detection on a page on Safari Mobile (a controller, if you want to know...). They all work well indepedantly, but whenever I have a first touchpoint pressed, If I touch a new point, the events are triggered when I trigger a new one.

For example :

• I hold the stick with a finger. It's not moving
• I press a button, a touchStart event should be triggered but is not
• If I move the stick, the touchStart event is triggered
• If I let go of the button, the touchStart is triggered, but not the touchEnd
• If I move the stick (touchMove), the touchEnd is triggered

You understand how in my case it's a problem. I get buttons triggered with delay, or getting stuck until I move the stick, etc...

Is there a workaround ? thanks