Zabbix alarm sends the same frequency as the trigger detection frequency

Just the Zabbix alarm sent the frequency and trigger detection frequency of the same problem solved, because I am in multiple problem events generation
This option has been ticked several times the same trigger on several times the alarm, so has been in Step1 thank you, thank you. @ Shanghai, Kent
It's been a long day for this problem.
When adding trigger multiple problem events generation this option does not tick, otherwise each of the same trigger will trigger an actions, so the event will not be upgraded, always execute step1. and the frequency of e-mails is the same as the frequency of monitoring trigger.

Zabbix alarm sends the same frequency as the trigger detection frequency