Displaying url

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.4.0
-- PHP version -- : 5.6.6
-- Browser(s) name and version -- : chrome 41.0.2272.76 m

I have got a problem with display in my browser.
I've built a multilingual website, with Hikashop
Now there is standing, suddenly at the end of the url ................shop / Lang-nl-NL or shop /lang-en-GB

i know it is the language, but at the beginning of the URL, just behind my domain name is also the language displayed.

It is not on al my pages but only the pages where hikashop is embedded.
I think it is just a setting somewhere in Hikashop, but i can't find it.

is there someone who knows how to fix this?

Greetz,
Edgar