Do you happen to use CloudFlare's DNS (1.1.1.1)? They have quite a long-standing [1] issue with archive.is. (or the other way around depending on your opinion)
[1]: https://webapps.stackexchange.com/questions/135222/why-does-...
[1]: https://webapps.stackexchange.com/questions/135222/why-does-...