Argos are known for one side driving faster than the other. This is considered normal. Bad bearings, tight chains, or even tracks could cause or contribute to this.
Lube the chains, make sure they are tightened correctly, and grease (or replace) the axle bearings.
On the road, if the machine drive crooked, check the tire sizes by measuring around each one. Some tires may be a bit larger than others even if they are labeled the same size and have the same air pressure.
Once you get it set correctly the machine ought to drive straight.
Stand for the Flag. Kneel for the Cross.