This occurs when we include an image that is too wide for the template. In order to avoid having the text cut off, we need to reduce the size of the image. The steps to reduce the image size are available at How to resize an image in a Communications template. The correct sizing of the image depends on the content of your template, but, in general, the maximum size for an image is 500 pixels wide (you can adjust the height as needed to maintain the resolution of the image).