Several. I empathize with you. It is an odd feeling to have. You feel like there is a spy in your life. Or, your PC is monitored or something. Whoops, that just my paranoia - LOL. My first one is still an unknown to me. The other violations were only notices of to put a question in the forum.
I wrote a poem a time back. Published it here and it came back duplicate content. I panicked thinking how could someone write my poem or who did I steal it from - I have memory challenges - LOL. Well, I know where I published it before. It was in two places. A chat room & a forum. So it is in the great big banks of some 7 - 8 year back dialogue and a long time back removed forum post. Or, someone stole it and posted somewhere else. So, I will post it at my blog site when I get it up an running. Sad, because it is in my eyes one of my best.