If you look at most helicopters while hovering, most sit at an angle. I owned a picolo a while ago. There
was mention in the instructions about this. They noted that if you could put a couple of pieces of balsa
dowel under one skid to counter act this while it was on the ground. The heli seams to pick up one
skid off the ground before the other causing it to want move in that direction. I do not recall what which
skid or which direction but it is normal when learning. You can usually tell which one it is by seeing which
lifts off first.

The more room you have to learn to hover the less effect the rotor wash will have on the heli. They will
be some form of rotor wash while it is in ground effect but if you can lessen it by maintaining a large space
to fly in.