https://wccftech.com/world-of-warcraft-classic-honor-fix/

Blizzard is close to fixing the World of Warcraft Classic honor bugs and stresses that all kills have been recorded.

For a few weeks, Classic players have been reporting issues with honor calculations not showing displaying correctly in the Honor tab. In addition, it appeared that honorable kills registered incorrectly and while they did show up in lifetime total kills, the kills weren’t showing up on 'yesterday’s kills' tab. Blizzard first suggested that these issues might be related to the display cache not working as intended but clearing the cache didn’t solve the honor issues.