post images display too large

Hi! I love this theme and everything was working fine until my site updated to 4.5.1 now all the images in my posts span the width of the post. When I try to make them smaller in the post editor they just become blurry and still display large. I checked my old posts and they are all doing that now, not just posts made after the update.

I tried disabling all my plugins and making sure they were all up to date.

fitnfancymag.com