dears all
I would like to ask you about your position in this case.I used this system for aleatoric place = using the start/end repeat barlines. But, I don’t know why - Dorico inserted the single barline before the repeat. See below 2 pictures in the same situation. Do any know why ?
I prefer the result without barline before…
There’s probably something off screen in another instrument - a time signature change or a key change or something.
dear Leo,
I would like to share the place around that. Do you have any ideas? 
It’s likely that the end-repeat below in the Vc. 3 has something to do with it. I’d expect Dorico to be able to put that end repeat close but not directly underneath the open repeat.
There are still other instruments off both ends of the page, so I really can’t be sure what the cause is. You can probably work around it using the Note Spacing tool in the left panel of Engrave mode.
This is a situation where it’s much easier if you post a project, not a picture.
I can confirm Leo‘s first suspicion from my own experience.