Edit collected data on Kobo server

Can anyone help on how to resolve an error when you want to edit collected data on Kobo server?
The error reads as below:

  • FormLogicError: Could not evaluate: position( /model/instance[1]/aZNfHgA4BFUEYJprhQ62SY/gSURVEY/gWATERCOL/gHHWLOOP ), message: nodeset provided to position() contained multiple nodes