Do you mean the
wiki button at the bottom of the mobile style, in the embedded php?
If so, it behaves exactly as it always has. It brings you to the 'forum part' of the wiki, showing each article as a separate thread basically.
It's the same as on the full site, in fact. Below all other categories, click on Wiki. Tad-dah, it shows you the same (though in a the full style).
The button bringing you to the Wiki's mainpage (the button at the top of the full site) is not included on the mobile version.
Also, the problem with the style switching to default probably has to do with the automatic detection of mobile devices and full computers. Because you force it into mobile for the app, it will save that setting in a cookie which in turn will be read by your browser when on the full site.
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