Why did two peculiar bottles of water freeze in my fridge?

Zondiaque

New member
I put a pack of 24 bottles in the fridge, and these two froze in my fridge while the others are completely liquid. Now here's the reason why I'm asking this, the safety peel is disconnected from both bottles, the thin plastic ring that only comes off when you open the bottle!! Should I discard them?
 
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