Problem with this animation... http://www.kf-interactives.com/clabsi-cleanConnector/
On the iPad, when you hold down on an invisible box to move the timeline forward on the iPad there is a little comment box that pops up.
How do I get rid of that?
Select your topmost element and uncheck 'Allow text selection'. The bubble is the way the iPad shows text you are selecting, which can happen for other elements.
Thank you @Daniel!