New Post: Documents Tab Download Link android

Dear All
I have a big issue with documents download on android mobile phones.
When I try to download a doc nothing happens.
Download starts but I find html file under download device folder, not pdf file.

My url is like this:

<a id="dnn_ctr781_ProductList_dlProductDetail_doclink2_0" title="EN_PARKETTKOLL_TOP_RU" class="DocumentLink" href="javascript:__doPostBack('dnn$ctr781$ProductList$dlProductDetail$ctl00$doclink2','')">Download</a>

Everything is ok on desktop browser and on iOS devices.
Any ideas?

Thanks
Alessandro