A WhatsApp button on a shop was dialling the wrong number. Not a formatting problem — a genuinely different number, three digits short of the one in the admin panel. The admin panel had saved it.
Source: [Dev.to](https://dev.to/mahmut_gndzalp_c736ac4b/mysql-will-quietly-eat-your-data-if-you-let-it-truncation-charsets-and-the-1366-you-never-see-2690)