If statement does not return expected result

job.ProductTypeId and product.GetProductTypeKey() are of type Integer.

If job.ProductTypeId is 3 and product.GetProductTypeKey() is 4 , this should result in false but that does not happen. Wrong implementation of IF statement?

if ((job.ProductTypeId <= product.GetProductTypeKey()) && 
    (product.GetProductTypeKey() < 4))