Bug with zoom function on iPhone?

Hello,
actually I'm working on a mobile website with 'Mobile Joomla' (www.cabrio.de) and i found a problem with the standard iphone template.
1. I open the mobile version of the website on a iphone and click any content-site for example 'home' and zoom in (that works perfectly)
2. Now i don't zoom out but open another content-site with a click in the menue.
3. The site which is now loading is already zoomed in and it's not possible to zoom out anymore.

I think this is a bug or not?
Big thanks for hints or solutions.
Regards

By the way it's Joomla 1.5 and the latest Mobile Joomla version.

The meta data for zooming in the index.php of the iphone template is:

<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">

Any ideas?

iPhone template in MJ has

(that prevents zoom at all) and your site has

instead.

Thanks for your answer but the site must be 'zoomable' and with 'user-scalable=no' zooming is not possible. Is there a way to avoid this bug/error with a active user zoomfunction?

You could try to keep width and initial-scale parameters in viewport: