Music note misalignment

I run Scorch with an old iPad2 and have a problem when an entire page of music is on the display, (in portrait format).

The issue is that some notes, particularly around the first line or space appear in the wrong place, so a note which is actually on the 'G' line appears below in the 'F' space, until the display is expanded, then it moves into the correct place.

Any suggestions?