Fixing Arpeggio Symbol

Hi,

I have a problem with the arpeggio symbol for guitar chords.
I set the height and the position I want (picture on the left) and then I save.
But after reloading the file, the symbol has changed (picture on the right). I am forced to change one random parameter of the arpeggio so that it moves to the right position.

Someone knows how to fix that ?
Deactivating the auto-placement doesn't solve the problem.

(and just in case, in my example, the guitar tab and score are not linked)