In print (and print preview), the measure 5 of the piano, i.e. the first of the second page, has two undesired ties, not present and not visible in the editor.
Where do they come from?
Does look like a bug. You can get rid of it by inserting:
!NoteWorthyComposerClip(2.751,Single)
|Chord|Dur:4th,Grace|Pos:3,5|Opts:Muted|Visibility:Never
!NoteWorthyComposerClip-End
at the end of measure 4,
but if this happens often it would rise to the level of an insidious bug.
The tie into the E is coming from the chorded E's in bar 3, and the tie into the G is coming from the chorded G's in bar 4.
I'm guessing that in both cases, rather than setting the tie before putting in the chord member, you created the chord, then highlighted it and set the tie. Because of that, both notes in the chord have ties that must go somewhere. One goes to the following note, as you would expect, but the other just hangs until it finds a note to go to.
Not sure why they don't appear in the editor though...
In short, you have a tie on both notes of a unison chord.
!NoteWorthyComposerClip(2.751,Single)
|Chord|Dur:Half|Pos:0^|Opts:Stem=Down|Dur2:Half|Pos2:0^
|RestChord|Dur:Half|Opts:Stem=Down|Dur2:Half|Pos2:0
|Bar
|Boundary|Style:NewSystem|NewPage:N
|Note|Dur:Whole|Pos:0
|Bar
|Chord|Dur:Half|Pos:0|Opts:Stem=Down|Dur2:Half|Pos2:0^
|RestChord|Dur:Half|Opts:Stem=Down|Dur2:Half|Pos2:0
|Bar
|Boundary|Style:NewSystem|NewPage:N
|Note|Dur:Whole|Pos:0
|Bar
!NoteWorthyComposerClip-End
You don't see the double tie because you set the tie direction.
I rescind calling this a bug.
I suspected somthing like that and indeed I also tried some changes but, apparently, not the right ones.
Thanks.