Font Size Changes when Fading Text By Paragraph

I have a very similar issue with textboxes that fade in from right or left. They would look fine in Preview mode, but would change size (and even proportion) when published. 

I figured out that changing the textboxes from No Fill to Solid Fill with 100% Transparency seemed to stabilize the textbox and now they all display the way I intended them to. 

I would like to provide the source SL360 file to the Articulate Team if that would help address this bug. At least I found a solution, but I'm not sure why it works!