I must have mine set up pretty well because I haven't had these issues. The combined shipping works automatically. The only time it doesn't is when I have a buyer who wants more than one item and they close days apart. Those buyers sometimes jump the gun and pay for the closed items before they're done. If that happens and I can combine in one package I will and then will refund the extra cost.
Maybe the issue is with flat rate shipping with no automatic provision for additional items? I add an incremental cost for additional cards and it seems to work perfectly.
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