Tesla (TSLA +0.65%) posted a disastrous second-quarter earnings report, sending the stock down 18% to a 52-week low. The week following Tesla's July 22 report was its worst since 2022, and the stock drop reduced CEO Elon Musk's net worth by $130 billion. But on the other side of the coin, Tesla stock seems to have found a bottom and has risen 8.7% since hitting that low. Why did Tesla's stock fall? On the surface, Tesla's earnings report didn't look horrendous.