language added to the domain/PolyLang switcher

Hallo, i have a problem with the language switcher, it adds the language to the domain…it has to do with the taxonomies in the polylang settings…how can i solve this? if i disable taxonomies, the product languages disappear…and the links point to the standard frontpage.

shop.com/?post_type=product&lang=de
shop-en.com/?post_type=product&lang=en
shop-it.com/?post_type=product&lang=it

the right links should be:

shop.com/?post_type=product&lang=de
shop.com/?post_type=product&lang=en
shop.com/?post_type=product&lang=it

thanx

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