There is no buckling at all, it just seems that the "teeth" are not
holding the siding in place. The siding is not falling off the house,
it just raises where the "teeth" are.
But, I do get the point here, If it is nailed too low, it will not stay
in place. I do not believe that is the problem, but I may be wrong.
Would you know the name of this tool for creating additional "teeth"?