Hi Imre, by all means if you'd like to send me more detais via pm so I can see what you are talking about exactly, then feel free to do so.
Although I feel that my earlier advice will still be true. The anchor (sitelink title) is automatically generated by an algorithm and not manually edited (as yet). I have seen some pretty random sitelink titles for other sites. I have even seen sitelinks where the title has been taken from some random piece of code on the site. Unfortunately, without knowing the exact details of the algorithm, there is very little you can do to influence the anchors other than what Google outlines in their guidelines (which is very little).
Like I said previously, if the title is that problematic and you want it gone, then your only option is to demote the whole sitelink.