Clicking "X" on a trade window resulted in the trade being accepted.

I posted a bow for sale for 140 div on the official trade site, someone messaged me to buy it (offer was 140 div), came into my hideout, offered me 1 div + 1 ritual precursor tablet and he accepted (I did not). I clicked on the "X" without accepting, and the trade somehow went through and I lost the bow. The scammer quickly left the area and put me in his ignore list.

I know this sounds like user error, but it isn't. I've traded hundreds of time in my 500 hours of EA playtime and am very familiar with how trading works. Never been scammed and I've bought/sold many multi-hundred-divine items.