Rebar bending

I am creating rebar with Create.FromCurves from #StructuralDesign package.
I put 2 cm offset but I get 1,2 cm. What is the reason? How to solve it? Probably is Revit issue, not Dynamo itself.
When I put some small bend diameter it doesn’t help.

image

could you please share the DYN graph of what you are doing? Also, what version of revit and dynamo are you using?