OP here.
Okay, so I took out my receipts (original one and the return one) and I am looking at them right now. Here's what it says....
ORIGINAL ONE:
Blanket-item price $19.99, you save $5.00, final price
$14.99
Apparel-item price $25.00, you save $5.00, final price
$20.00
Apparel-item price $20.00, you save $4.01, final price
$15.99
Then on the bottom it says 15% Pick Your Day (I have never used a coupon at this store before so maybe she had one at the register that she scanned)

Anyhow, it says that I saved $7.65.
My total that I paid cash for was $44.09
The item that I returned was the last item that is marked as me paying $15.99 (I only bolded the prices because they were bolded on my receipt)
RETURN RECEIPT:
Sports Apparel-
Return Amount $15.99
Trans Disc $2.40
For a total of $13.59 that was credited to me
I was going to call and try to find out what this all meant, but after writing it all down, I know now that it's the 15% discount that she scanned in at the time of purchase. I just thought by the looks of the receipt that I had paid the $15.99 AFTER the discount and thought I should get $15.99 cash back for my return. But I just realized by doing a little math that if you take 15% off of $15.99 it comes out to $13.59 (which is what I got back) My mistake.
Maybe I just looked at the receipt and figured that I paid what was in bold print. Oh well. Got my panties in a bunch over nothing. Thanks for listening to my rant though