Misaligned fermata

[Hilary Snaden]

A strange misalignment has appeared in one place in a score (Lilypond 
2.14.1, win32). Instead of sitting over a barline, a fermata has been 
placed beneath the upper staff of a pianostaff. Elsewhere in the same 
score (e.g. in the upper staff in the example) it's coded in the same 
way but placed correctly.

I haven't so far been able to replicate this in another score. Has 
noticed this odd behaviour before?

--
Hilary Snaden