\version "2.19.80" % same in 2.18.2 \score { << \new StaffGroup << \new Staff \with { instrumentName = "Horn I in E" } { e'1 \break e' \bar "|." } \new Staff \with { instrumentName = "Horn II in E" } { g1 \break c' \bar "|." } >> \new Staff \with { instrumentName = \markup { Bass clarinet in \concat { B \flat } } } { \key fis \major fis1 \break cis1 \bar "|." } >> \layout { indent = 50 \mm } }
this happens when the first note is low and it is a whole note. It also happens with whole measure rests and causes the other staves not to be aligned with the staff which has the longest key signature