Language is changing in a middle of checkout

J2.5.4, Falang, latest hikashop

My site has two languages: Lithuanian and English (default). When user in Lithuanian part of site adds product to cart, he is asked to login or register. When he registers site language changes to English(default) (but only part of it, because main menu is left in Lithuanian). It seams that only hikashop part of site changes language. If i refresh page in this point it goes completely to Lithuanian again because in url there is LT language symbols, but customers don't know that they need to refresh page. How can i force the site/hikashop to stay in the same chosen language and not to jump to default in a middle of checkout process?

Can you give a link to your shop so that we ca see that ?

www.pharmaDNA.com

but now i've changed default language to LT and everything seems ok. So the question is why hikashop jumps to default language in a middle of checkout process?

I tried to register on the checkout of your website with both english and lithuanian and the language didn't switch with neither.
HikaShop does not change anything regarding the language during the registration. We don't have that problem on our demo website for example.

yes, because now i've changed default site language to Lithuanian. Tell me when you will be looking, i'll change it back to English, and then you'll see.

Well, I can't say. I'm currently traveling and I look at the forum when I can...

If that's solved for you, then it's ok.

but i want to make default language English and i'm planing to add another language soon, so please can you look at my site when you'll back?

Yes, I'll be back next week. Please reply again to this thread next week.