That's weird. I'll e-mail them.
I found a few videos of the rabbits doing "hopping" wich is kind of similar.
I put a pole on the ground and two bins and started teaching Tedd to jump over them. LOL he caught on 10 minutes later.

I just said this to them

I was browsing your site on bunny agility and saw this about litter training.
We have found that a kitty litter box works well for rabbits. Hospital pans are great for smaller breeds. You can buy pet litter pans in a pet store or pet dept. You can use kitty litter, pine shavings or sand as litter for your rabbits. Sand will make a mess, it is the best liked by rabbits but is the least liked by humans, but it is cheap.
I thought I would bring it to your attention that none of those suggestions are good for rabbits. Kitty litter dust can give the bunnies upper respratory diseases and lung problems. Not to mention if it is digested wich most bunnies try to do it can cause a blockage and kiddney problems and urinary. Pine shavings or any shavings for that matter are bad for them too as they too can cause URI and they are sharp. Sand isn't good for them incase it gets in their eyes,they eat it and it dosent absorbe odour very well.
You should recoment people use Yesterdays News or products alike.