Board Game Arena

I've played a lot of games and every time I finish the 4th column - my opponent gets a chance to place the last tile before scoring.
But when my opponent finishes the 4th column first, I am not allowed to place the last tile and the scoring begins immediately!
What kind of injustice? And then I get beat by a couple of points because of it. Correct it.

It depends if you're the first player or not first player have a flag on its board/player panel, that's how you know if you'll end the turn right away or not.