Cannot deselect all lists when removing lists for receiving campaign

Using phplist 3.3.3 on Centos 7.

I noticed that if I have a number of lists selected as the recipient of an outbound campaign, and I want to de-select those lists in one shot, clicking or unclicking the “Select All” tick box does not deselect all - I need to manually go down the lists and unclick each and every list.

I don’t remember prior versions behaving this way. . .