Why a 'lang folder' is auto-added at the end of a multistore shop url?

[stratboy]

Hi, I have a prestashop 1.6 installation. I have multistore configuration. I have some stores already ok, but now I created a 'german' store with /de url, and have the following issue:

- the shop url is something like www.myexample.com/de

- when I navigate to www.myexample.com/de, automatically I'm redirected to www.myexample.com/de/it/

I really cannot understand the reason why... All the other shops (fr, es) do work properly. This one does not. No way to keep it /de. I already setted a default language for it, I just copied all the settings from the other shops, seems all the same. I cannot spot the error. Could you please suggest me why it is behaving that way?

Thank you, regards