How can I increase the success rate of the login process?

This happens with a high probability when logging into NC.
The first time, it returns to the initial state after the user enters the correct account information. The second time the user enters the information, the login succeeds.

It happens to all my NC users, regardless of whether they are on a PC/Mac or a smartphone.
What should I suspect to solve this?

CentOS 7.8, Nginx 1.20.1, PHP 7.4.22, MariaDB 10.2.40, Redis 6.2.5

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