How do I fix this problem with vertices? I'm modeling a car. the middle of the hood (the centerline of the model) was originally a single edge but then subdivided. When I grab any vertex along that line, this happens. It pulls up a single vertex like so. I am using a mirror modifier. What am I doing wrong? Comment and ask for any additional information you need. Thanks.
Nevermind, I figured this out thanks to Duarte. Wow im a noob. Ngons were my problem for anyone referencing this problem.