If you are experiencing repeat questions, the most likely reasons is that you are playing with a question pack that you have completed and there are no new questions left to answer.
This article should help you understand how this works:
Question packs – what to expect
Outsmarted’s core categories contain a total of more than 7,000 questions.  These "core" categories are: TV, Films & Books, Pub Quiz, Quick Thinking, Sound & Music, Back to School, and Breaking News. Breaking News is updated weekly with fresh questions and we ensure the others are kept generally current. Outsmarted contains two to three times as many questions as a traditional trivia game, so you'll get a lot of hours of play before you "complete" these Core categories.
Add-on question categories
The additional question categories available for purchase from the app store or the website contain (this can vary) 80 - 120 questions which may be split over different age ranges.  Each category has a description on the website which will tell you how many questions are included. Typically, the packs are 100 questions for $2.49  - the equivalent of $0.025 per question! Once they are complete, if you continue to play them, you will get repeat questions because no new questions are available to ask!
If you're getting repeat questions in categories you haven't completed, then we strongly recommend that you speak to our support team. We can run diagnostics remotely to see what is going on in your game and can help advise you on the steps needed to resolve it.  Please send us your licence key along with the question category in which you're experiencing repeat questions.