Why is Zabbix constantly updating the event age?

Question

Zabbix

Zabbix 3.2.1 constantly updates the age of events and does not close them.
There is a template that monitors free space on host hard drives. Check interval is 1 minute.
For several hosts on the Zabix panel, the age of the event is constantly updated after checking and does not disappear when the problem is no longer there.
More clearly it looks like this:
Host1, with free space less than 20% of the total volume of the partition, should generate a problem with the "Warning" importance, in the "Event Age" column, we should see how long this event has been hanging, 3 hours, 2 days, or several months. But in fact, the time elapsed since the moment of occurrence is not preserved. Every minute (our check interval), the age of the event is reset to 0 seconds, reaches 59 seconds (one second before the next check) and starts counting again at the next check. At the same time, in the last data received from the host, the value of free space on the partition is 34% and the event should completely disappear from the panel, which also does not happen.
Clearing the history for a data element basically solves this problem, but this method is not very desirable to resort to.
This situation occurs with several network nodes, with different data elements that are monitored through different proxies.
The MySQL database for Zabbix is ​​spinning on another server, partitioning by days is configured for tables with history.
How can I fix this problem, preferably without resorting to clearing the history?