It seems that Opera Moderators are (at least widely) bots.
We have the same issue and the only information we found is this one : https://forums.opera.com/topic/35488/omnibox-issue
It was at the top of the page when we published the extension. You should probably have something like this (you can submit a new version to see it again).
If you have informations or find a way to contact the moderators, please write it here or on our issue to notify us, we'll do the same.