php artisan queue:listen

[2019-10-02 19:27:35] Processing: App\Jobs\SendEmail

[2019-10-02 19:27:35] Processed:? App\Jobs\SendEmail

[2019-10-02 19:27:35] Processing: App\Jobs\SendEmail

[2019-10-02 19:27:35] Processed:? App\Jobs\SendEmail

[2019-10-02 19:27:36] Processing: App\Jobs\SendEmail

[2019-10-02 19:27:36] Processed:? App\Jobs\SendEmail

為啥會執行三次？