The mining process is inherently random. Even without a change in mining distribution or hash rate this can and will happen.
It's like rolling a dice and having it come up "1" five times in a row.
Discussion
Shine the light Gigi ✊. True, that too. CC nostr:npub18r46yhgk0640p5j4vy9lkyvrsx2d4ft54kk2qulghpcl5jnca8lqht9sv5 for another bullet point