@Libby14
as you said this was probably misunderstanding. In the future you should treat your guests like small children when you give them any info or instructions. Short but clear. Never assume they understand, assume they don't.
I don't want to say that all guests are stupid, but, some of them don't understand and don't speak very well English, some of them are not thinking, some of them have a head full of informations because they travel and visit so many places in a short time, some will come from totally different cultures and have different habits...
I would write them in a private message that they obviously didn't understand me and in the future they should not do that and should read labels . That's not what you do when you are ABB guest.
But you are not the only one with this experience. If you rent your home to strangers while you are away you should remove all your personal stuff in a separate room and lock it. Maybe this guest have done it because of misunderstanding, but someone else will maybe do it deliberately 😞