Looking under the hood, this issue could become a big problem for the company.One of the hottest stocks this year has been Carvana (CVNA 1.82%), which has risen over 228% in 2024. The online auto retailer looked like it was on the brink of bankruptcy a couple of years ago, but it has engineered a solid turnaround.The company has been posting some strong quarterly results that have encouraged investors. However, a new red flag has recently emerged. Let's take a look at the used car sales specialist and why i ...