I have used a LeftBracket autoshape in my slide. The ouput that I get for the same coordinates in Microsoft Version 10 is properly aligned whereas in Microsoft Version 16 the LeftBracket is tilted. I have also attached a sample screenshot of output that i get in both Versions. Version10.JPG (16.8 KB)
Version 16.jpg (35.6 KB)
Kindly look into the issue and provide a solution for the same.
I have observed your comments. Can you please share source presentation, generated result, sample project, PowerPoint version both for PowerPoint 2010 and 2016 along with environment details and also please share which Aspose.Slides version you are using on your end so that we may further investigate to help you out.