Well, the source path ended in docker so that's how it went over.
What I would do is make sure you still have everything in /var/lib/docker as it was.
Stop the docker service:
Then delete the erroneous copy:
Then restart docker:
Then in OMV WebGUI open System | OMV-Extras | Docker Tab.
Then set the Docker Storage path as /srv/dev-disk-by-id-ata-ST31000528AS_5VP8RK5N-part3/docker