Programming error or my fault?

On 18.01.2017, a Gomoku tournament was held in the 5-9 grade age group. I managed to line up all the necessary pieces, but my opponent won. I took a screenshot of the game victory. It is clearly visible that my opponent named AneteK places his piece last and then the victory goes to HIM! Screenshot here

There were more than 5 buttons in a row. It doesn't count.

Gomoku rules state that there must be EXACTLY 5 pieces in a row.