The stem of a note in Voice 3 collides with (a whole) note in Voice 1.
How do I avoid collision?
Using shift-alt arrow keys move all voices simultaneously.
Move single note horizontally
Perhaps using Voices 1 and 2 instead of 1 and 3 would help. 1 and 2 are a pair, as are 3 and 4. I'd only use 1 & 3 together in exceptional circumstances.
You can shift a note using the X parameter in The Inspector.
You can shift a note using the X parameter in The Inspector.