Tire Chains 23x10.5x12 Why Will Tire Chains Not Fit On My Lawn Tractor. My Tire Says 23x10.5x12 And The Box From Sears Says The Same

Why will tire chains not fit on my lawn tractor. My tire says 23x10.5x12 and the box from Sears says the same - tire chains 23x10.5x12

But when I was on the tire chains too short. Can the builder put the wrong size chains in the box?