How is this possible?

Savage M12
1/9 twist
.223
55gr Varmit Nightmare X-Treme HP
24.5gr IMR 3031

Out of 65 rounds today, I had 5 tumblers.

Four of them were tight in their groups.

I left this one alone to show how accurate it was.

All 60 shots and four tumblers were in tight groups.

What is up with this??