Paper position appeared out of nowhere, no sign of a filled order

Today I found a short position of 164 shares of HUD in my paper account. However to the best of my knowledge I have never placed a sell short order for it. I requested (though a Python code) the complete order history since the first day of my paper trading (which is June 19) and I found all other orders on it, but not this sell short order for HUD. I searched my account through the web site for my HUD activity, and it says “No activity yet”. How come? How and when did it get there?