Contact
The fastest way to reach the maintainer is email. Corrections that cite the global client or an official patch note get priority — the site's whole method is verifiable numbers, so verified counter-evidence always wins.
Reporting a data error
Include the page URL, the number you believe is wrong, and your source (client version, patch note, or in-game screenshot). Disputes between community databases are welcome — that is exactly what the dual-source method is for.