videos jump left in tablet when navigating

I've just noticed that my mp4 videos jump left only in tablet when navigating to an adjacent page. I have popup text appearing from events in the videos. The videos and text look fine in desktop and phone views. When the video jumps left, it is actually moving to the correct x coordinate. When playing, the videos are appearing to the right of the set x coordinate, which is wreaking havoc with alignment with other elements on the page. In other words, the tablet is not appearing as it does in Lectora in a live environment.

Anyone else have this problem or know a solution? I'm assuming this is a bug...I'm submitted a Support Case with a video of my experience with tablet view, showing the video shifting left.