I got that same one a few days ago. It was on the first page of it and it said #4 was not correct. Then it said I had a 0% rating which is lower than what they want. I usually have no problem with these, but every once in awhile I'll have like a bad week or something. I know I'm answering the stuff right. The only time I got an answer back from hitting the feedback button was when I clicked on the help button on the top right corner of the screen and then hit the send feedback button. That was the only time I got a reply from them. Of course they said that task was over with and there was nothing they could do, but at least they replied.
Exact same thing happened to me. I replied at the "this is not fair" tab. There was some serious problem this time. I really hope it gets fixed soon. These are the only high paying thing thats helps me a lot to reach the cash out. Hope it comes back.