As the name says I can't add any tag to this picture: https://wallhaven.cc/w/d6jqy3 and to this one too: https://wallhaven.cc/w/2yv5l9 But I can add a tag to any other picture, including others from the author. EDIT: also this picture too: https://wallhaven.cc/w/wegrj6
And the all three have the same topic.
Why and how does it work?
And I want to add the "Propaganda" tag, because it is.