It is possible that those "left unaddressed" do not show enough proof, or had been addressed by Roobet and was already solved privately and the posters never or forget to come back after the problem is solved. Most people that have issue just came to post their problem or frustration and when everything is settled they just leave and never bothers to come back to say it is settled.
Thats possible. Usually those who have complaints are creating an account here to rant about their issues on the particular casino. If the problem is resolved privately by the team, those gamblers dont bother anymore to update the thread especially if they are not interested to clear the casino about the issues for causing them inconvenience.
When you ask them why void, the answer will be something like this.
How much is your bet? The support said that there's an internal issues thats why the bets are refunded. They have reason why it happened. Do you have doubt about it?