Hi Sencha touch Users

I have somes problems with the panzoom on my charts. I have the problems on the linechart and the barchart.

When i zoom a lot i'm losing a part of the linechart and the scale.

http://i.stack.imgur.com/NfVwR.png

The part of code i'm using :

Code:
interactions: [ {type: 'panzoom',
            axes: {                left: {                    maxZoom: 2                },                bottom: {                    maxZoom: 4                },                right: {                    minZoom: 0.5,                    maxZoom: 4,                    allowPan: false                }            }        }

And the same problem for the barchart
The code i'm using:

Code:
{                type: 'panzoom',                axes: {                    left: {}                }            }

http://i.stack.imgur.com/s3YbI.png

Does anyone had this problem ? And resolve it ?

Thanks