Update QSO with Data from Internet does not work

[HB9TZU]

Good day Swisslog user

I have some QSO's (212) in my logbook where the QTH is not entered. I would like to change this and have sorted by QTH under View: Logbook[].
Then I marked the QSO's where no QTH is entered. Then right-click and select "Update with Data from...." and Refresh selected QSOs.
In the right-hand area, I select City (QTH) and then Refresh QSOs.
Unfortunately, the QTH field is not updated and remains empty under View: Logbook[] even after refreshing (Refresh selected Data) the list.

If I double-click on a QSO without a QTH entry and switch to the Callbook tab in the QSO input window and click on Copy all, the QTH is adopted.

I am aware that not every OM has stored his QTH in the Internet (e.g. QRZ.COM). But if I mark several QSOs, the synchronisation from the
Internet does not work, if I update the QSO individually, the transfer works.

Am I doing something wrong or is it a bug in the programme?

73 HB9TZU Christof