Have had brain surgery 2x a new problem now, and a leg that does not work when seizing, opposite side of surgery. told was crazy leg. explain please?

See a neurologist: Brain surgery is a kind of injury. There can be various effects on your neurologic system. Problems with muscle and limb function are usually on the opposite side of the surgery. You should see a neurologist to clarify the reason. Likely getting rehab therapy could be part of the solution. But you need a diagnosis first if this is a new problem.