Your experience mirrors mine. My wife and I used Walmart+ for grocery deliveries basically every week for a year without any issues up until a couple of months ago. Suddenly, they started fucking up every single order, delivering things to the wrong address, missing items, or even claiming to have delivered an order that never arrived. After calling and complaining for the 10th time in a row, we gave up. We were so pissed off we even made a point of canceling the service, even though we get it for free as a credit card perk.