What A and C said - the Robin is a pussycat on the ground if it's been set up properly. Yours hasn't.
You can sort of alleviate it by easing the stick forward after landing and gentle steering movements (ours only needs 10-15deg before the wheel brake starts coming on) but suggest you get to a shop that knows the robin. Aidan at Dunstable, or AKKI at turweston should be able to help.