I discover this error a few weeks ago, but I thought it is only a temporary issue. Of course, I have games, and they work properly, only the mentioned profile page has this problem.

It's a site problem that's been ongoing since at least November 10th. See below for a staff response; there's been no update since.
https://www.gog.com/forum/general/my_profile_shows_zero_games_why/post30

Thanks for both of you., I didn't find the another topic. Sadly, I can mark only one comment as solution.