Your Capital One Walmart card changed to a Capital One Quicksilver card primarily because Capital One and Walmart ended their credit card partnership.
The cessation of the long-standing agreement between Capital One and Walmart led to significant changes for cardholders. As a direct result of this partnership ending, consumers who held a Capital One Walmart Rewards Card or Walmart Rewards Card saw their existing accounts converted. Most notably, these cards were replaced by the Capital One Quicksilver Cash Rewards Credit Card. This conversion occurred even if a cardholder already possessed a separate Capital One Quicksilver card, indicating a full transition of the former Walmart-branded accounts.