I'm telling you guy, I put $39.94 worth of goods in the cart, and I got the 15% discount, but no free shipping. (For info purposes, they were two Nintendo DS video games.)
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I'm guessing you are probably correct, but I would rather leave it for Admin to investigate before making changes myself. Seriously, it just happened to be the first thing I tried it on to check it out.
Look at the bright side... You got an activity push out of the deal.