We're a bad rebounding team, but not as bad as that statistic indicates. I prefer to look at rebounding differential. That is, the gap between our number of rebounds and our opponents. The Raps are 21st in that.
It's misleading to just look at the average number of rebounds we get per game, because we play at one of the slowest paces in the league, and will thus be at an inherent disadvantage. We're one of the 5 slowest teams. That's objective, not an opinion. There is a stat for posessions per game (pace). So, given our slow pace, there are fewer rebounding opportunities because of fewer posessions.
Like I said, we're still bad, but not horriawful.