How does alert notifications work?

Hi guys , I have an issue regarding alert notifications:
When navigating “Alerts” → “notifications”.
There are just a few notifications.
For instance, I can see only 7 notifications and they are not even the more recent ones.
Im receibing nearly 10 notifications per day but they are not listed.
Why is this happening ?

This is my validate.php out:

bash-4.2$ ./validate.php

Component Version
LibreNMS 21.5.1-20-g70023c0
DB Schema 2021_04_08_151101_add_foreign_keys_to_port_group_port_table (208)
PHP 7.3.27
Python 3.6.8
MySQL 10.5.9-MariaDB
RRDTool 1.4.8
SNMP NET-SNMP 5.7.2

====================================

[OK] Composer Version: 2.1.1
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct

thanks guys!