Bug - 6 in a row does not win?

I recently played a game, where I had 6 in a row (vertically) and the game did not stop. This should have been a win, because I had 5 in a row (plus 1 I didn't even need).

virág520

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🚩️

Hello perectolvaj!
It depends on the opening whether 5 or 6 wins! Please read the gomoku game rules that I have attached to you!
I wish you more good games!
Regards:
virág520.

https://www.flyordie.com/games/help/gomoku/hu/

Madressa

6 in a row can only win in "free style" opening rule, I think