DC, thanks for the response.
CC reader at 711 said approved, then subsequently a "credit" showed up and the transaction was cancelled. i.e. "approved", then -500.00 and -3.95, and 0 due.
Dealing with keystone cops at this location, initial clerk yesterday had to call someone to ring it up. She did, no prob on first trip yesterday. Second trip, first card approved no problem. Second card, above "credit" occurred. Clerk (different from original clerk) stated "we get bad VR's sometimes, maybe try another one". Grabbed a different one of the rack, same thing. Thanked clerk for trying and went on my way.
JUST went back again to hope system had "reset".... but got the approved/ then credit trans again (again with keystone cop #1). Cops boss says "debit or cash only, credit card doesn't work".
Who knows. I picked up a couple here and am happy. May try again tomorrow before my flight out of ORD tomorrow PM. Just curious. I have multiple Charlie Victor Sierra's at home that I can acquire at, but only 1x points. Was looking to leverage 2x if possible