I guess no one expected Slovakia to defeat Belgium. In my opinion, it was the biggest surprise of the tournament so far. Also, it was unexpected that Romania won the championship with such an overwhelming advantage over Ukraine. This is a great morale boost for Romania for the other matches. Additionally, if Belgium suffers another defeat, they will leave the tournament. The second matches will be very critical matches.
I was really surprised that Belgium lost their game against Slovakia today, if somebody predicted that Belgium would lose, I would have disagreed because they have top attacking players. Belgium conceded a goal seven minutes started of the game, and I thought they would be able to come back and win. In Group E, I thought Belgium had a chance to top the group table from beginning to end, but they surprised me by losing today. We shouldn't judge them based on their performance in the first match, but Belgium needs to improve in their next match, as they will play Romania, who defeated Ukraine with three goals.
In addition, when two goals from Lukaku were disallowed, I believe that many gamblers were going to be disappointed because they were expecting Belgium to win the game.