This has been a known issue for quite some time. Divisi staves are always added below. If you want the solo staff on top (as is mostly the case), it will connect to the tutti staff before it, not appear as an extra staff above, thereby ‘bumping’ the gli altri down. I hope this will be changed, as it really doesn’t feel right. But rest assured the Team is aware of it.
As mentioned, one solution (workaround) may be adding the soloist as a separate player that’s hidden most of the time, and add this player to the tutti string part layout.
Just wondering if there are any updates to this issue. I’m running into problems as well. I have a divisi for a solo line in a section player (choir sopranos) and the section/gli altri system has a tie, so everything gets messed up when creating the solo divisi. The solo line does not appear above the section line (ugh!) and I can’t switch the staves to fix this. Also, a phantom diminuendo and lyric extension line appears below the solo line (appears to be carried over from the section part just before the divisi?). I know I can add an extra player, but this is a pain when making the choral score as I have to go in and hide every instance of this player except for this solo line. Thanks.
A follow-up. If I begin the divisi right on the bar which it begins, I get a whole note from the section staff (not desired in the solo line), as well as the phantom lyric extension line. See here:
Unfortunately there are no updates here as yet. You’ll have to make a compromise on the casting off, I guess, so that the solo begins at the start of the system.