Does The Butter In Your Fridge Smell Like Cheese? There's A Reason Why - Tasting Table
Briefly

Butter can sometimes carry a cheese-like aroma, which is common in raw or cultured varieties due to fermentation processes. This smell is generally normal if the butter retains a buttery taste. However, if there's a sour or rancid smell, the butter may have spoiled, particularly if raw butter is improperly stored. Additionally, butter can absorb odors from nearby foods in the fridge, so proper storage is important—preferably using an airtight container, and keeping it in the coldest part of the refrigerator to maintain freshness and flavor.
If you've ever opened your butter dish only to be hit with a cheesy aroma, you're not alone - and you're not necessarily dealing with spoiled butter.
Some types of butter, especially raw or cultured varieties, carry a cheese-like scent due to fermentation or unpasteurized cream, which is perfectly normal.
To prevent butter from absorbing unwanted odors, store it in an airtight container or tightly wrapped to keep it fresh.
If your butter smells sour or strongly rancid, it may have gone bad and should be tossed for safety.
Read at Tasting Table
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