N600 cable modem router c3700v2, strange exterior access points? Is this a security issue?

Hi! Please forgive the nontechnical language here, I'm a college student and this is my first router.... a few days ago I started noticing connectivity issues, I ignored it, thinking it was just one of those things, than yesterday I saw my wifi... access channels had been replaced with suspiciously named ones. Does this mean someone is spying on me or using my wifi? Help me Obi Wan Kenobi, you're my only hope!

Thanks in advance, a photo of the mysterious channels is attached