Mystery Objects and Animations appearing

Hello,

I am building a presenter project based on a PPT storyboard that was previously created by a 3rd party. In preview mode, animated objects appear, and I cannot figure out where they are coming from. They do not exist in editing mode. They appear to be from a previous version of the same course, as they are similar to the objects in the current version, and appear in approximately the same place at the same time. Is it possible that if the PPT was built on top of a previous version of the same PPT, that there were animations that were deleted, but not 'really' deleted? If so, how can I remove them? If not, have there been cases of similar problems?

Attached is my current working file. 

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