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Debian Stretch - software-properties-gtk - updates tab - when there are other updates is grayed out


I've been trying to find an answer to the below:

Desktop    :    Gnome 3

Package    :    software-properties-gtk

Issue          :    Click on the updates tab, the dropdown for 'when there are other updates' is grayed out.

I've tried asking on #debian on Freenode a number of times and nobody seems to know why, any suggestions would be appreciated. The official screenshots page shows it as I have explained above, though I have Recommended updates (stretch-updates) selected :

- https://screenshots.debian.net/package/software-properties-gtk

Many thanks