I keep mine sorted by type in stacks. So mine does what you’re describing by design.
What you’re describing sounds like a bug.
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I keep mine sorted by type in stacks. So mine does what you’re describing by design.
What you’re describing sounds like a bug.
I had a similar problem while I was using macOS High Sierra (so that is a couple of years ago), albeit I was not using the snap-to-grid setting. After almost every reboot the operating system seems to have "forgotten" the icon arrangement. What helped was a third-party-app that remembered the icon positions. When the icons were displaced again after a reboot, you could restore their original position with one click.
Unfortunately I don't remember the name of said app (It's been a while, and later versions of macOs didn't have this issue). It's something along "keep icon positions" or "icon arrangement manager".
I hope this helped.