Firewall lose some rules after reboot

Hi folks,
I have strange problem with firewall. I have regular rules in firewall, several I added when I bring up this server before one year. Before approx 6 months I added new one rule which works till I restart server. When I restart server, that rule not working, and I need to remove and re-create that rule.
What can be a problem, thank you?

HestiaCP v1.6.14

I don’t understand this reply with docs link?

If you enter the new rules like that it will make sure that they will be stored

When I add a rule and click Save, the rule is in the rule list and that rule works well. When I restart the server, rules are in the list but don’t work, and I need to delete and create the rule again every time.

Any idea for this issue?