XL Chart Pasted to Powerpoint is "distorted"

When pasting Excel charts (as pictures) to PowerPoint my charts appear distorted in PowerPoint. For example, the relative size of my pie chart(s) to the entire graph (border and all) changes when pasted to PowerPoint. My chart title appears to have moved closer to the actual chart than it was when viewed in Excel. These distortions are minor, but annoying. Does anyone know why this happens? What can I do to prevent this from happening? Resizing the picture in PowerPoint does nothing as everything remains relative in size and distance. The issue is not with the size of the entire chart when pasted, however, the issue is with the proportional size and proportional distance of each object in the chart after pasting. Basically, once pasting to PowerPoint you don't get exactly what you had in Excel. Please Help!!