Market Makers if they see a down trend, they will

Market Makers if they see a down trend, they will sell into that trend. They shorted some starting around the 44c range last week. I've tried to roll over some profits from other stock and pick up a few more 39s this week a couple times. My bid is hit, but the MMs don't give me my shares. I got frustrated after seeing it a few times and just changed my bid, if it goes lower I will buy off the ask. That is usually when they are covering a little, using my bid to soak up shares or they are expecting a bounce, so they keep them. Happens all the time with me in otc land, especially CDEL, they are trading and at the same time taking your bids. They are not suppose to trade on the same side as orders they take, but who is watching-- especially with otc? Usually a sign the bottom is in, but if another big seller shows up, it could go lower... we will see.