I don't know what happened or how I managed this, but my order ended up being only $9.28!!
Subtotal was $12.14
ShopRunner shipping: FREE
Estimated tax: 0.00
Total savings: $7.85
These discounts were noted under my total amount:
FREE 2-day ShopRunner Shipping
Online Coupon Click & Save an extra $2.50 on select Kleenex
10% off at drugstore.com
Save 20% on KLEENEX facial tissue
Possibly that $2.86 discount is money you had in your drugstore.com cashback savings? That's exactly how my discount looked (for a different amount, of course). You earn a little cashback each time you shop, and every so often (quarterly, I think?) they deposit the money in your account and you have something like a month to go in and spend it. They just take off the cashback discount automatically when you check out.