Undesired Shadow Effort applied to Shapes

When I open a PTOX file, and then save the file as a new PPTX file, several shapes (rectangles, ovals) are getting shadow effects applied to them without my code even referencing or working with these shapes. Why would this be happening?

Hi Mary,


I have observed the comments shared by you and request you to please share the source presentation, generated presentation and sample code used. I will investigate the issue further on my end once the requested information will be shared.

Many Thanks,