wflickinger I also have had this issue but not on all my songs it appears to have some reason it does this but i havent put my finger on it yet, i have let Peter know and my quick work around is to just select the end of the lyrics and hit enter a number of times this makes the song lyrics appear longer and it will allow you to scroll so you can edit all your lyrics. Then when your done delete the empty lines at the end so the automated scrolling knows how to calculate the scroll speed.
My Auto adjust editor font size has allways been turned off and i have had the issue, so im not sure if thats the cause.