Miter Template size

I am trying to print out the templates of a bike frame I have done but after testing them on the tubing they are all to small? ie the Down tube/ bottom bracket fits fine when it is rolled and taped but roll it round the tube it is 11mm out? and it is the same with all of them?

I have gone though all the tube sizings and there fine? I exported them as A4 for my printer.. am I missing something?