Hi
So it must have booted into the snapshot....? At GRUB advanced option do you see this snapshot?

On my SLED 12 SP3 I see;
Code:
dracut --print-cmdline

resume=UUID=852981f9-f3a8-45ee-a793-eac221e8521a root=UUID=6f38513f-8a76-41ee-b9ff-44de1d8b8701 rootfstype=btrfs rootflags=rw,relatime,ssd,space_cache,subvolid=257,subvol=/@,subvol=@
The other place to look is /etc/default/grub, if you make changes remember to run;
Code:
grub2-mkconfig -o /boot/grub2/grub.cfg
Maybe there was an error running this during install?