Hi,
It seems that the issue is that the part /lt/buyer-meniu is duplicated in the URL which doesn't work.
And apparently it doesn't come from when HikaShop generates the URL, but there is something which adds it to the URL and redirects to it on your website.
And apparently, it happens for the menu item with the alias buyer-meniu but not with the menu item with the alias pirkejo-meniu.
I would guess that it comes from another system plugin on your website.
It could be something related to languages, SEF, menu items, etc.
It doesn't seem that it is something related to some HikaShop malfunction or wrong setup.