About 60 GND ID statements have an invisible UTF8 markers at the end of the value when accessed via the query service. It's U+0200F (“RIGHT-TO-LEFT MARK”, https://decodeunicode.org/en/u+0200F).
These values have been entered by different users.
The values are fine in the Item UI as well as the JSON and TTL exports. They show the issue in the csv export and query service UI.
This file contains Items that have a GND ID statement with the issue as well as the values for these statments: