Yes, I have noticed this same issue as well. Especially with many columns like a gallery grid I built. You have to move the objects in the grid around in the breakpoints for them to play nice and institute your changes.
I’ve never used the auto grid. So I don’t know about this one.
Also I don’t want to use the auto option since I prefer to set my column widths to specific values.
I have also noticed this. Any time I modify the grid layout or number of items displayed in the grid, I need to rearrange each breakpoint at least once (even if it already looks correct in the grid editor).