have you tried running `ovtopofix -a / -A` ? you'll need to run
`ovstop netmon` first.
see ovtopofix man page:

"The ovtopofix command is used to detect and correct inconsistencies that
  might develop between the IP topology database and the ovwdb database.  The
  default behavior is to remove old hints from the ovwdb database and to ver-
  ify the managed and removed state of all objects. As inconsistencies are
  discovered, ovtopofix reports actions taken to the standard output."


Regards,

Simon