Crypto-bridge is often the first exchange that many coins, especially MN coins, will trade on and therefore are very vulnerable to trade bots that can easily tank the price of a coin. These trade bots generally put up large walls that are very hard to sell or buy through and then do small spot buys in between those walls, gaining 15 to 30% for each swap. They rely mostly on people who want to get into the market quickly that do spot buys and people who are desperate to dump back into BTC to make money and they make a lot of it each day. You can always check the Bridge to see the accounts that are buying and selling. Two of the accounts that perpetrate this the most are gaut01 and Kalder56. If you see their orders, do not fill them and just hang onto your coins.