Is it bubble hash? This is a common method of making hash using only water and ice, and if the hash maker does not properly dry the hash, it will mold very easily, just like bud after a harvest.
Look at it under a magnifying glass or microscope if you have one; you should be able to see inconsistent colors/growth on it if mold is present. Something else you can do to find mold is to encourage more of it by placing some (half a gram or so) in that glass jar you have and don't open the top for a few days. If there's mold, then it will grow even nastier and become pretty obvious in a short while. If you bought this from a dispensary, I would take it back to them and ask or at the very least notify them of the problem you are having.
If it IS mold, you might have a few options here. You can try drying it out in direct sunlight with some good ventilation for a couple of days. If the problem persists, you might need to do something more drastic, like soaking the whole thing in isopropyl alcohol and extracting some hash oil out of it (killing the fungus) or you might have to throw the whole stash away if the mold is really out of control.
Do NOT take this lightly. Mold is one of the most dangerous indirect uses of cannabis and yes, it can be DEADLY.. Please, figure out what the hell is wrong with your hash before smoking any more of it and asses the problem immediately.