Hi there!
My plugin does not mess with anything related to the text position. It just applies the fonts to the specified windows or scenes. Other than that, there is no way for my plugin do that behavior as you show on the screenshot.
So, maybe the font file itself is meesed up? Or maybe it needs an specific font size to work properly? Try to change the font size on the plugin parameter or on the message window itself, with escape codes to check if the text will show properly.
Are you using any other plugin that messes with the message window? If yes, can you try just using the Eli Book and the Font manager to check if this is a compatibility problem?