Suburbia images in first two posts stretching out over text

Hi!
Loving Suburbia, but I’m encountering some problems.
The biggest problem is that the images for the two most recents posts (top of the page) appear stretched out and end up over overlaid on the text. I’ve tried resizing, cropping, set image vs insert into post, and nothing has worked. It is driving me crazy! I can’t figure out where to change it on the stylesheet!

I’ve also changed the dates on posts that appear fine in terms of formatting so they show up there and they end up with the same stretched out look.

Interestingly, if through navigation I go to the next page, the top two posts look fine there.

This is driving me insane! Could someone please tell me how to fix this?

Here’s my site: blog.cheeseplus.com

Thanks!