John, I understand that. I imagine that is the nature of the Titles and Text plug in to use with animation. Mousing over the preview window will light up a text box to manually move the text back to where you want it. The same box has four handles in the corners to resize the text if you run past screen right. The text box in the preview window is only highlighted when you use the “edit generated media” button in the text event.
The left align box in the tool bar works to keep the text of each line to the left margin. It all gets moved and resized in the preview window to insure the space for animating the text as I understand it.