Huh, I do this all the time — I just do not have enough time to do any Codeforces Round until recently so I just read the problems and ponder(?) about them in my free time. Also I want to improve my thinking speed for ACM (I rarely code — my code sucks) so it really helps. I also have friends who read problems and seek for solutions without participating to gather as many ideas as possible (lol idk how it works but oh well).

Not trying to 'solve' the case or anything, just pointing out it is not that abnormal at least for me.