Drawings on slides created in earlier versions of PowerPoint, such as boxes and circles, become distorted when pasted into new presentations. This occurs despite saving the earlier presentations as .pptx files. This distortion does not occur immediately. It occurs when other slides are pasted into the presentation or when the presentation is saved and reopened. The same problem has occurred with PowerPoint 2003. When the distortion of the old images occurs, some newly drawn circles also become distorted.

Hi

Try to handle the issue by selecting the option "Disable hardware graphics accleration" in File>Option>Advanced>Display.

Regards

Tylor Wang
TechNet Community Support