Page editing gives an extra text widget When I try to edit a page that already added am getting an extra text area movable widget as shown in below screenshot. 



Is it a bug or an issue with the settings in for the content type page?
You seem to have your field's cardinality set to greater than 1. Change it to 1 and the problem should be fixed.

In case you already have data in the field but you are sure to only have one value stored per entity change the column "cardinality" in the "field_config" table manually to 1.