I've seen this happen before and it really messes with my head. So, the main reason walmart stock dropped after their earnings is that sometimes Wall Street just isn't happy even if a company's making good money. It's not really just about how much Walmart made—it's more about what investors expected them to make. If they beat earnings but give future guidance that sounds iffy, or if costs are rising, people freak out and sell the stock.

Walmart's got like 10,500 stores and is always making moves to compete online with companies like Amazon. But in this last report, people mentioned they're raising prices on some stuff and not on others, and that freaks people out because everyone's worried about inflation. Even when they say stuff is under control, people still get anxious, especially with groceries being such a big part of their business.

I've noticed on certain finance news sites that stocks do this all the time. Even if everything looks fine at first, someone gets nervous about the future, and boom—the price drops. I've seen friends who own walmart stock just laugh it off and wait for it to bounce back.