Image stretches by oppening

Hi,

I already contacted support for getting rid of scroll bar on the image, when it opens.

But after that I have a problem, that image opens too low on screen and it doesn't depend on size, even small sized images (500x500px) by opening get stretched to a larger size and positioned low on screen.

You can take a look here: cottonyhotchkiss.com/index.php/portfolio
And here: cottonyhotchkiss.com/index.php/portfolio

Please help.