Why are these lyrics being left aligned?

[Eduardo Vieira]

Hello, list! I've been reviewing one of my first songs typesetted with Lilypond
and noticed a problem that I don't know how to solve:

The words for the tenor and bass  become left aligned after these voices are
splitted and put back together.

See the picture where it shows the words "O do not falter" (on the bottom)

Attached goes the source file.

How can I arrange the lyrics placement so that "O do not falter" don't become
left aligned?

Eduardo
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trustintealign1.ly
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