Why questions are frequently repeated in challenges 😕?

Answer 1

It is because they only have a certain amount of challenge questions, I think. I'm not really sure. You can email Sololearn at [e-mail] to send any suggestions on how to change this.

Answer 2

The RNG is not being reseeded too often, apparently. I just played around 20 challenges with maybe 8-9 same questions repeating in all of them.