If you're scrolling a site proposal with more than one page of example questions, sometimes the order is not consistent, so you see the same question again when moving to another page (and presumably miss some other question).
This happens frequently when question scores are changing due to you or someone else voting on them.
I've also noticed that questions are sorted by default by "my votes" or "all votes". Where is exactly that randomness the SE staff has been talking so much about lately?!?