Pagination & qtranslate issue

Hello!
I get an issue with qtranslate and pagination.
On my category pages, I have 3 posts per page.
On the default language, the pagination works fine but when the visitor is on another anguage, the pagination redirects towards home page.
The URL is : https://mysite.fr/?lang=es/category/spectacles/page/2/&lang=es
this should be https://mysite.fr/category/spectacles/page/2/?lang=es.

Plus, always with a non default language, when I am over a page link, the URL displays https://mysite.fr/mypagename?lang=es&lang=eslang=es. But when I click on the page, the URL bar shows the correct form https://mysite.fr/mypagename/?/&lang=es

You can check this site to see what I mean.

Please I really need help on this!

https://www.ads-software.com/extend/plugins/qtranslate/