hi every one

i am trying to model transverse loading on composite material using czm. I have faced an unusual behavior in my model. To the best of my knowledge, we can define initial thickness of cohesive element in section property by both "use nodal coordinates" and "specify" option, and we should just change modulus (in traction separation properties) with respect to our choice .ie if we use nodal coordinates we should multiply "k" by "h_eff". My problem is when i compare 2 model, one with "nodal coordinate" and modified modulus, and one with "specify:1" , i don't get the same result. Any recommendation?