Different things hatched in Triop kit?

So I got this kit for triops and after 3 days 1 triop looking thing did hatch. But then 2 of the little twitchy bug things hatched 4 days after I put the eggs in, still no more of the triops, then now on the 5th day a TON of these little twitchbugs were swimming around, and im amost positive its not triops because i looked at them under a microscope and they look like a see through bug. what are these? and are any more triops going to hatch?