Language is taking the wrong translations in OC 1.5.5.1

Hello there,

Thank you for reading my message.
I am wondering whether you can help me to solve the following issue.

I have OC 1.5.5.1 with 4 shops running on the same backend.
The following languages are installed and running on the frontpage " Dutch(default), English (admin) and German.

The languages are doing their job, but as soon as i go to the checkout (and there is a translation for the dutch and german checkout on the server) the language changes to english. Which is fine for bi-lingual customers. But i do want to have the checkout to be in dutch, as translated on the server.

anyone who can help me fixing this silly problem?
Thanks a million!

Kind regards,
Vanessa
www.miss-salsa.nl
www.prima-ballerina.nl

haha. euh... I changed the route in the seo urls module and now the language is working fine..

in case anyone comes across this error.. change the route in seo urls..