This issue is trivial i know..
i had earlier the "verse per line" setting on, i tested to have it off, and noticed that there are differences in row spacing between verses.
I don't know if this is necessarily a bad thing. At least in my book version of the bible the line spacings are the same.
The lines that have a (superscript) verse number in it has 6px more distance to the above row than other lines.