Flip box behavior all wrong

The flip box grid is not working the way I would expect it to. Normally, you could upload a square image, and it would shrink down to the size of the original square. It doesn’t. I’m just seeing the corner of the image I uploaded.

Then, as you shrink the page, all the squares should stay squares. But they do not do that. They squeeze in. Then, when the grid has fewer columns, the squares turn into wide rectangles. (Or, if the image is too small, it just leaves white space to the right of each image.) These should be square all the time and should adjust in size according to the number of columns. Can you help please? This looks terrible the way it is.

The first two images at this link are large squares. They should be showing the whole image, not just a corner. Then, when the page shrinks down, those squares should expand into two columns and still be squares! They should not change into rectangles.