Storing my mycelium - bag was open and half used and covered in a plastic bag

Hi -
I'm new here and new to mushroom cultivation
I am a forager and have a permaculture smallholding and really want to turn it into some kind of mushroom haven.

I bought a 6litre bag of oyster grain spawn less than 2 weeks ago ( 13 days ago).
I opened the bag and used some, and then put it in the fridge (not sure of temperature in the fridge).
I loosely wrapped a plastic bag around the opened bag of spawn.


I went to use it today and am wondering if I was right to cover it with a plastic bag or if it may have contaminated from it? There was some 'juice' in the bag and it smelled quite mushroomy (I guess that might be normal?).
The mycelium at the open end of the bag was a bit harder and starting to yellow, and also watery.

What might the effects be from placing it in the fridge in an opened bag (covered with a plastic bag)?

I used all the mycelium today in my buckets but would like to know if anyone has any feedback, as I'm about to crack open a second bag and will not use it all, so want to make sure I will be storing it properly....


Thank you in advance!