My combat log with chronomatic anomaly has trouble

Warcraft Logs
1

hi. Im not speak English well.

https://www.warcraftlogs.com/reports/BLpXPmFRgVDnQdwY#fight=43

We cleared any monsters completely before starting a combat with the boss.

But, about 2minutes is added in the combat log.

i can’t find the reason. I have another log with the same problem.

https://www.warcraftlogs.com/reports/fg7Qm4kpHvZKADYc#fight=12&type=damage-done

I want you to tell me the reason and to fix the problem.

Thank you.