The FVF is on the total cost to buyer.. what they pay (combined cost of postage) not the individual amounts for postage in each listing.

If items were listed before 6 May and sold afterwards, they don't have the FVF applied to postage, so that may be why some sales haven't had it applied an some do at todays date.

How do other countries deal with combined postage? They have had this new system for awhile now. eBay reps should know how to deal with it by now and be able to advise sellers who ask about it.

They (eBay ) probably have the thought that if buyers willings pay too much postage ( individual amounts instead of waiting for combined).. to0 bad for them, don't need to refund them.. more FVFs for eBay if the amount is not reduced.