Check your image sizes.
Simple test..Change content width to 1400 if you can see images in full you will need to tweak image sizes and/or content width
For three columns the default width is 308×308 with a layout setting content width of 1050 ..the math doesnt work because the padding on sides of and between images.
You either need to increase content width or image width. I think for 4 columns I tried image width 230 pixels with a content width of 1050.
developer @ uquitsmoking.info