Wrong display the size of image in the board theme

Today, I found a error in the size of image when I use different browsers. As you can see in the screenshot, the size of photo display in Firefox and Google chrome is not fixed the frame compare to Internet explorer. I think that is come from some update from SE officer.

Anyone have the same issue? How can we resolve the problem [52,Jung Kim] [250,Drew Frey] ...? We need your advice!

Thank you so much.