Random thought...

I store my milk in mason jars in my fridge and I noticed that the last two jars had an off smell but not like a sour smell. Do you think it could be from the fridge? It kinda smells the same. I wonder if its absorbing the fridge smell... I was thinking it might be high lipase but not all the jars smell like it... I've never frozen my milk... maybe I should start freezing it at night before bed? Any ideas? I pumped for a year with my 3rd and did the same things and noticed the smell occasionally, and it was the same smell...😑