I Second that! I placed some orders at 1sat on Cryptopia and then I was in queue. 24 hours later all my orders were filled and since "people" just bought as crazy at 2sat I just placed a sell order for that price.
36 hours later, orders still in progress and the queue for 2sat just down even to 0 or dissapeared, and then after reload again 60/70btc in queue.
Pure scam, and I believe Cryptopia is involved. I dont think an external bot is doing this, It was internally coded. For this reason they closed alt markets and "the official Paccoin page" warned about Yobit, so you trade Pac only in cryptopia.
I lost a few bucks, because of course now price is 1sat and there is a 65btc queue for sell them and "recover" my small investment.

Trade with caution, I believe this is a big scam.