WordPress Table didn’t look right

The displacement could be result of the theme you are using. You will have to check what is the width of your content area and compare it to the table overall width (main image + side images + padding inside the cells + padding between the cells + borders, if you are using any). You should also consider any padding of the content area in the theme.

The easies way to avoid going through all of the above is to start testing different sizes of your main image.