I'm sitting ninth in the order queue to buy some shares in a...

I'm sitting ninth in the order queue to buy some shares in a company that has had about a 30% retrace in price. There are 700,000 plus shares in front of me at the same bid price yet my order has been partially filled on two separate occasions (approximately 35% of my order in total). The trades are listed as nxxt and this has happened to me three times before in the recent past but with different stocks (partial fills when I'm well down in the order to buy). Anyone else had this experience or an explanation? I'm thinking someone is trying to entice people to buy at the offer price. Or are there are some fake bids ahead of me??? I'm not complaining as the price has just jumped 4% whilst typing this but it is interesting.