While you can have 0.00000001 part of a coin in your wallet, the trading happens at minimum 0.00001 part of a coin. Plus this 0.00001 part has to be equal to either 5$ or 10$.

what is Why are all the tokens left after selling, the trade is not closed, no one can tell why. For example, one token was bought at the rate of 10.22 points and sold at 10.90 points. Why are some left?