Hello Jogchum, You have a GrandStaff on the top level (I guess for spanned barlines?). This will add a brace by default. This brace cannot get arbitrarily large, so it only spans part of the System.
Two solutions:
Just get rid of the GrandStaff (if you do not in fact want spanned barlines,
which is usually the case with choral music as they make lyrics placement
harder), or change the start delimiter to a barline by doing
\new StaffGroup \with
{
systemStartDelimiter = #'SystemStartBar
}
Instead.
Cheers,
Valentin
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