Wick is smaller than Tambor (1.5lbs, roughly the size of an American football) and he can jump 15-18in (height of his pen). I will note that some times it’s circumstantial and based on what I think your rabbit perceives at the correct height.
Wick can clear his pen when he really wants to be out, but some times he’ll jump for the bed or futon and end up slightly missing it because he’s underestimating the height. He really only jumps that high when it’s to get out of the pen. It’s a very specific scenario though; there needs to be something on the pen wall to make it look solid (hanging a towel there for shade). If nothing is hanging, he doesn’t try it.
Wick also contemplates landing and jumping-up spots carefully, and still hesitates at times. I think this is just normal rabbit behavior when it comes to cliffs.
He really face plants in all other scenarios lower than 18in though. I’d say unless Tambor looks injured, he’s probably quite normal? I cannot make guarantees though. I doubt you’ve given him the need to jump very high since you love him and wouldn’t scare him to such a degree!! 
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.