It looks like for whatever reason the deli meat wasn't eligible for circle savings. I know milk isn't eligible. I haven't read through the disclaimer recently but like many coupons there is a paragraph of all of the ineligible items using circle savings.
Target Circle Earnings rewards cannot be redeemed for the following:
adult beverage purchases;
dairy product purchases;
purchases of prescriptions and over-the-counter items located behind the pharmacy counter;
purchases made at some partner businesses, including in-store clinics, Target Optical and Target Plus Partners;
Same Day Delivery purchases, purchases made on the Shipt app and tips for shoppers;
purchases made from Target through third-party sites such as Google Express;
purchases of Target GiftCards;
purchases of specialty gift cards; and Visa, American Express and Mastercard gift cards/prepaid cards;
purchases fulfilled via email (for example, video game digital downloads and digital specialty gift cards);
taxes, bottle deposits, shipping, delivery, handling and all other fees or charges;
payment of any RedCard balance, debit card cash withdrawals at checkout and payments for insufficient funds;
prior purchases; or
where otherwise prohibited by law.
Other restrictions may apply to redeeming Target Circle Earnings rewards.
I wonder if your deli meat was coded as Dairy. I know that when I get those mixed meat, cheese, and nuts snack packs, they are coded to not work with circle.