Tandem pump users

Found a big air bubble in the leur-lock section of tubing (which happens frequently). Tried re-tightening the leur lock to make sure it wasn’t loose to let air in, then re-primed it. As I was re-tightening the leur lock section, I heard a ‘crack’ sound, as if I tightened it too tight and it cracked? I don’t see insulin leaking, but has anyone had this cracking sound ? Was it ok? (Am still learning about this pump).

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The air bubble is usually there and wont hurt you. The other, I have no idea!

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