Why do I keep getting banned?

My Android smartphone (Pixel 7) keeps getting banned from my HA servers (HA OS Core 2024.12.0, Supervisor 2024.11.4, OS 14.0) .
I reach 2 of them via VPN and 2 of them via Cloudflare tunnel and I experience the ban on all of them.
I’ve increased the login_attempts_threshold to 30, but that’s not what I want to do.
How can I investigate this problem?
Thanks!