If you regularly cook savory foods in your Instant Pot, then the O-ring might have picked up the scent/flavor of that food. The first batch of yogurt I made had

If you regularly cook savory foods in your Instant Pot, then the O-ring might have picked up the scent/flavor of that food. The first batch of yogurt I made had a faint "taco meat" taste for that reason. Vinegar, lemon juice, etc. didn't work to get the smell out of the O-ring, so I ended up just buying another, which I use exclusively when making yogurt. Alternatively, you might be able to just take the O-ring off when making yogurt, since you don't actually need it to be sealed, but I haven't tried this.