not saving CUSTOMERS_TO_GROUPS both group pricing and customer groups

[OJ_SIMON]

PHP Version: 8.0.30 (Zend: 4.0.30)
PHP File Uploads: On
Upload Max Size: 100M
PHP Memory Limit: 512M
POST Max Size: 100M
Database Engine: MySQL 10.6.17-MariaDB-1:10.6.17+maria~deb11-log
Database Host: localhost (127.0.0.1)
Database Date: 19/02/2024 18:22:19
Database Data Size: 2,783 kB
Database Index Size: 1,055 kB
MySQL Slow Query Log Status: On
MySQL Slow Query Log File: /var/log/mysql/slow-query.log
MySQL Mode: STRICT_TRANS_TABLES, ERROR_FOR_DIVISION_BY_ZERO, NO_AUTO_CREATE_USER, NO_ENGINE_SUBSTITUTION

I have also downloaded ZC V1.5.8 2 x now thinking it was that and compared them and no difference is shown in Beyond Compare v4.

can someone help me on this please?

[OJ_SIMON]

this worked:

https://docs.zen-cart.com/user/local...g_date_format/