Issue: Combine shipping has a glitch.
I just got off the phone again about my customer being overcharged. I do have my flat rate rule set up properly.
eBay does know they are having this problem
By: DingDong
Are you experiencing this issue?

DingDong Thumbs Up
March 22, 2019
  13:41 PM
They told me to raise my shipping on additional items so they will ask for an corrected invoice.