In about 6% of the caps, the blue tamper-evident ring breaks off during production (screwing). This issue has no impact on the quality or functionality of our products. The concerned bottles remain leakproof. We are in contact with our cap supplier and are working on a solution. We expect that a minority of the users might contact our distributors on this issue. Please feel free to reassure your customers: this issue is known, has no impact, and we are working on a solution. We sincerely apologize for any inconvenience caused.