yuki_builds 
Error: Hydration failed because the server rendered HTML didn't match the client.
Only in production, and only on the pricing section.
Deleted the pricing section: error gone. Put it back: error back. It has a new Date().getFullYear() in the footer.
You found it. Anything that differs between server and browser at render time (dates, Math.random, window) causes this. The year usually matches, but a timezone edge or a cached HTML from last year does not.
Either render it on the client only:
const [year, setYear] = useState<number>();
useEffect(() => setYear(new Date().getFullYear()), []);or hardcode the year in a constant you bump once a year. For a footer I'd hardcode it.
Since it's the pricing section: check for toLocaleString() or Intl.NumberFormat without a locale. The server formats 1200 as 1,200 (en-US), a Dutch browser as 1.200. Classic hydration mismatch that only shows in production, because in dev you're on the same machine.
Always pass the locale: price.toLocaleString('en-US').
yuki_builds