API Zabbix 5.0, please help

[vraskoshnyy]

Hi. I am writing a telegram-bot on PHP, which should receive from Zabbix via API a list and number of Problems that do not have a "acknowledged" state and whose severities is from 4 to 5, including 5.
I can easily get such a list in the web interface at

https://localhost/zabbix.php?action=problem.view&filter_show=3&filter_application=&filter_name=&filter_severities%5B4%5D=4&filter_severities%5B5%5D=5&filter_inventory%5B0%5D%5Bfield%5D=type&filter_inventory%5B0%5D%5Bvalue%5D=&filter_evaltype=0&filter_tags%5B0%5D%5Btag%5D=&filter_tags%5B0%5D%5Boperator%5D=0&filter_tags%5B0%5D%5Bvalue%5D=&filter_show_tags=3&filter_tag_name_format=0&filter_tag_priority=&filter_show_opdata=0&filter_unacknowledged=1&filter_set=1

= i get 10 Problems

But if I make a request to the API such as this

{
    "jsonrpc": "2.0",
    "method": "problem.get",
    "params": {
        "acknowledged": "0",
        "severities": ["4","5"],
        "suppressed": "0"
    },
    "auth": "__auth_key__",
    "id": 1
}

in response I get 442 Problems.

Please help me understand why there is such a difference in the result? What am I doing wrong?

Thank you.

[vraskoshnyy]

I also saw that if I add the "time_from" parameter to the API request and specify, for example, the timestamp minus 1 hour from the current time,
then the response will contain the correct result. But how can I get the result from the API exactly the same as the web version of the Zabbix interface?