sidebar pushed down past content

Hello, I’ve searched for this topic and have read through many threads, but nothing I’ve tried has fixed the problem so far. If there is a missing </div>, I’ve yet to find it.

Very grateful in advance for your help!

My sidebar is pushed down past the content area.

http://www.isabelladurante.com/blog

1) I’ve deactivated all my plugins and tried re-activating them one by one. What happens is that for a while, the sidebar moves back to the correct position, and then after activating a certain number of plugins (the specific ones always seem to differ), the sidebar widgets move back down. I then disable my plugins one by one but sidebar doesn’t go back up until I disable all at once. (I hope this sequence is clear!)

2) I’ve changed the theme from Nirvana to Twenty-Fifteen and nothing changed — the sidebar placement was still messed up.

I know there have been many topics on this issue, so apologies for the repeat, but I really could use some help identifying where the error is in my site so I can fix it!

Again, thanks so much for your help.