compatibility with wp-touch-mobile?

We have really problems with the compatibility to wptouch-plugin:
https://www.ads-software.com/plugins/wptouch/

We get only the cached desktop site. If i cleared the cache , the mobile site is shown only until the sites are cached again.

I have default configuration nothing special. Mobile support and support for wptouch is enabled in wp super cache.

Are there any solutions to geht this to work?

thank you