Grace notes that belong to different notes are grouped incorrectly

[Danix78]

This grace note shouldn’t be here!
It is also displayed in the other staves.

I’ve tried these tips too but they don’t solve the problem.

Score Editor, help needed urgently

Quick question… I see that in the 2nd screenshot, bar #21 is the first bar of the page. Was it also the first bar of the page in your 1st screenshot? Do you have time to try a little experiment?.. Try Forcing the previous grand staff (i.e. the last staff on the previous page) onto the next page, such that bar #21 is now on the 2nd grand staff of the new page. Are the grace notes now visible? (sometimes there can be a bit of strangeness when the notes actually belong (MIDI-wise) to the previous…