can powder nutrients go bad?

i have a 400gr container of nutes that recently has a very strong odour. the container was left in a room, usually the room is cool because its upstairs and its been fall. though when i first got the container it had a similar smell but not as pungent. almost smells like there is a hint of mold, but with a magnifier, everything looks fine. should i be putting this powder in the fridge?
 
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