Selection in search window remains after reload

1.- search for several entries in Search... -> Find contacts
2.- select several items and for the selected, choose "Add to group..."
3.- add them to a group
4.- click on Done when the success message appears
5.- you get back to the same search as before, but the selections are not unmarked.

This is pretty embarrassing, as I'd like to do add all entries to different groups and each time they have to be deselected first.