Is the leak recurring? If you've cleaned it, let it rest, and it still leaks within a few hits, the device is likely faulty. Look at the bottom — is there sticky residue around the charging port or seams? That's a sign the internal seal has failed.

Also check your storage. Extreme heat or cold can cause leaks. Don't leave a vape in a car or near a radiator. If multiple devices leak the same way, your storage or the e-liquid itself might be the problem.