This is something that has been driving me insane for so long that I just turn advanced tools on and off even though I would like to have it on all the time.
When I turn on complete features/advanced tools, this happens almost every time I move a region. I'm trying to move it directly on the beat aligned to the grid, but with smart snap on, it consistently goes slightly before the division or beat. Snapping to bar/beat isn't flexible enough, but "smart" does this, refusing to sit right on the division. Snap settings plus a screen recording example included below, I'm not sure what I have wrong. Why is it doing this?
Advanced Tools Snapping Slightly before bar.mov