Calibre-web can't show columns that are of the type "Columns Build from other Columns" it's in the Wiki FAQ
here and it's showing grrating and grvotes in the id field there because that's where they are in Calibre.
I'm not sure but the
Action Chains plugin might be able to copy the information from the grrating and grvotes ids to a new column (integer) then delete those ids from the id field. That should give you lines that look like the pages entry and remove the items from the identifiers area.
The people over in the action chains thread will be able to help you work out how to do that.