Hello, I have noticed this as well and I have fixed the problem as I do not want customers paying multiple postage cost on multiple items. To fix: Go to revise your listing, then edit,

scroll down to postage area (mine shows additional 1.20 postage fee for each additional item...very wrong! ) In the box delete the additional postage and type in 0.00. If you leave it blank..it will auto revert to 1.20 additional fee. To test; list the item then go and revise again to see if it stays at 0.00. Mine is now okay. Let me know how you go.