Billable weight is often reflective of dimensions rather than actual weight. Billable weight is accurately calculated when you enter accurate dimensions and weight on the label purchase page.
You need to look at the reason for the adjustment which may not be weight - it may be additional handling for non-standard packaging. How did you pack the set? Were they in a box?
Check your cost adjustment and expand the section on the bottom right that says "see cost breakdown" and post the details of the cost adjustment and cost breakdown here. Also provide a physical description of the package. That way we'll be able to help determine the reason for the adjustment.
Walk without
rhythm, it won't attract the worm.
