RE: Attitude on the Ground?
Stiff landing gear is reuired on a " smooth ? surface " . Any cracks or bumps theat are running the same direction of take off & landing can and do yank the plane around if it has springy landing landing gear.
Sometimes enough to cause cartwheels, left and right. Depends on the wind coming from a foward direction angle.
You can think you caused it . Fast or slow makes no difference. Bad luck.