sidebars interfering with posts AND not formatting properly

I modified a 3 column Kubrick based theme for my blog, and I’m having issues with the sidebars. The left is fine, minus the fact that I’d like a bit more space between the widgets… But the right isn’t working correctly. There’s a paragraph break after every line — not what I wanted.

Also, the left sidebar is interfering with my posts — the top post on the page. It’s not ending the post until the bottom of the sidebar… adding a lot of dead space.

I could use some help with both of those issues.

My blog is found here: https://www.thiswench.com

Thanks!!