I am making a DVD with selectable subtitles. I use DVDAuthorGUI to author the DVD and my subtitles is in SSA format. I previewed it in Virtualdub using the Textsub filter and it's fine. However, when I burned it to a DVD and watched it on my DVD player, the very first subtitle line is missing half a line. This is what it looks like:

Original:
"I'm fine, he's\ndoing well too."

DVD Display"
" doing well too."

The first part of the line is invisible for some reason. Why is this? I have never encountered such a strange problem. There is nothing weird with the subtitle line when viewed in Sub Station Alpha either. Can someone please help me?