looking back through all of my transactions to post, it seems that was recorded as a buy not a short... even though I was pretty sure I had shorted it and had already made a bit of money from it falling from about $1.50, and showed as a short. Guess I may need to screenshot my holdings now and again to be sure..
I guess I'm just a bit crazy after all, at least there is nothing stopping it from in theory working that way...