EBay (EBAY) stock wavered late Wednesday after the e-commerce company's second-quarter results exceeded expectations. Guidance for the September quarter was mixed. San Jose, Calif.-based eBay reported adjusted earnings of $1.60 per share for the June-ended quarter, up 17% from a year earlier. That beat the $1.50 per share that analysts polled by FactSet were forecasting. Sales increased 15% to $3.1 billion, compared to…