Octave shifts in polyphonic setting

[Jogchum Reitsma]

Hi,

When entering a piece of music with some one-, some two- and some 
three-voiced bars, quite often notes in previous bars go up or down an 
octave, when entering new bars.
Restoring this from the first bars affected by adding or deleting 
apostrophes or comma's, sometimes lead again to side effects. Rather 
frustrating...

Is there a way to prevent this?

regards, Jogchum Reitsma