The Web AppBuilder Attribute Table widget CSV documentation states, XY values exported use data's spatial reference but the XY values are exporting as Web Mercator spatial reference.
Last Published: April 19, 2018ArcGIS Online
Bug ID Number
BUG-000108913
Submitted
October 18, 2017
Last Modified
September 22, 2022
Applies to
ArcGIS Online
Version found
5.3
Version Fixed
6.1
Status
Fixed
The bug has been fixed. See the Version Fixed and Additional Information, if applicable, for more information.