A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
How did you insert the chart in PowerPoint?
Is it by using the insert chart option within PowerPoint or copy/paste the chart from an Excel file?
Open PowerPoint file, Click on File and info, at the bottom right corner do you see ‘edit links to files’?
Does this issue occur with specific file or across all the files?
Create a new file and check if the issue persists.