[diabeetusman]

I can only solve the first one. I click submit, get a "Solved" stamp, and it prompts me with the same problem again.

[doronlinder]

The first two are cases of selecting the whole table. Since it's (completely) randomised, there is a chance of getting the same table twice. I didn't account for that :-P If you solve it again, you'll get a new case following that.