dynamic markings positions

[Matevz Jekovec]

When having a separated dynamic markings staff, using (in 3/4 measure 
timing)
s2.\f
shows Forte sometimes in the beginning of the measure and sometimes in 
the middle of the measure. Also, when trying to force the positioning, using
s8\f s8 s2
shows the marking the same way as before. Sometimes it works and 
sometimes it doesn't.

Could someone please explain these markings positions a bit?


- Matevz