How old is your walmart discover? If it is new, afaik, gecrb mid-cycle updates every walmart card the first month (or after first purchase)
Wallet: Capital One Cash Rewards 3500CL, Wells Fargo Cash Back College Visa: 900CL, Paypal Smart Connect: 1286CL, Walmart: 1300CL, UPromise Mastercard: 1000CL, Chase Slate: 500CL, Discover IT: 1000CL, Citi Forward: 1500CL, Bank Of America Student Travel Rewards: 700CL
