I need help with Combined Shipping Discount Rules

[somanypcs]

To remain profitable I have just switched from free shipping to $1.00 shipping for 1 or more postcards paid for in a single transaction.  My setting specifies I offer combined shipping.   On the Promotional Shipping Discount Rules - Manage postage settings page I clicked Edit and selected Maximum shipping cost for single combined payment order and in the Specify cost $  field I entered 1.00. 

On my listings in the Combine shipping discount section I have checked Apply my promotional discount.  Anyone looking at a listing of mine who clicks on the Shipping and Handling tab sees "Pay a maximum of $1.00 shipping on all eligible items from somanypcs."

Imagine my surprise when I went to send an invoice to a buyer who won 11 auctions today and saw a shipping charge of $11.00.  I changed the shipping cost to $1.00 before sending the invoice.

I'd appreciate any insight into what I did wrong or how to create a Promotional Shipping Discount Rule and/or Flat Rate Rule that works so that a combined shipment has a shipping cost of $1.00.  I'd also like to know if I have set things up correctly and this is an eBay invoice glitch.  TIA.

[wooden_flower]

I'm sorry to hear this problem is back.  I see nothing in your listings that would cause this to happen.    I think you should ask for help on the tech issues board -

https://community.ebay.com/t5/Share-eBay-Technical-Issues/bd-p/technicalissues-db

If no one there has a solution, the issue can get escalated to tech support there.

[hollyhock_toy_shop]

Did anything come of this?  I am struggling with the same general issue and it is a nightmare.  

[somanypcs]

I no longer use the promotional shipping discount which sometimes charged too much for shipping as the discount was not applied.  I now only use the flat rate shipping discount and have had no overcharge errors.

[stitchinbug]

I have had the same problem, I have combined shipping with the postage supposed to be calculated on total weight. I have come to the conclusion the combining only works with an individual item. If they order 3 of the same exact item, it works, If they order 3 different items, it adds all the postage together and charges them three times the postage. Then I have to go back and credit them the overpayment. 

I have been trying to get combined shipping to work for years off and on. Still haven't found the secret combination. 
Tell people to check out and ask for a total but that only works on a pc. not on an apple or phone.