I've noticed lately that without the "catch-up exp" in the game, level differences in ARAM tend to be pretty extreme. Sometimes 2-3+ levels. This is very common now. Where simply being the one who gets focused means that you will forever be a level or 2 behind everyone (For example, they hit 6 you almost hit 5). Getting killed multiple times just makes the gap worst. It use to be where unless you were AFK, the level difference was typically no more than 2 for the most part. Now I have seen games where it is a 4 level difference between the highest and the lowest.