Hi @YourMusic.Pro!
Yes, it’s definitely a text item (MusGlyph font), that I used after reading a post on a thread in this forum about repetition signs for chords (MusGlyph, as I suppose you know better than me, is a font suggested by John Barron in one of his tutorials and you can find it on NotationCentral website).
Your tip was ok and I solved my issue but I ask why the issue occurred only for that specific sign and not for the others? Dorico is a wonderful but really very complex software!
Thank you so much for helping!
Art