HELP! Comment area gone crazy

I don’t know what happened, but I put my search form on the header and aligned it to the top nav bar. Soon after that, I noticed that my comments area went berzerk on me and extended right onto the sidebar. I did not change anything on the stylesheet.

When I took out the searchform from the stylesheet, it didn’t do anything to the comments area. So, I’m thinking something else must be wrong.

Can anyone check it out and tell me what’s wrong? Please? Thanks for the help!

https://flipstah.com