session data lost after redirect in CI 3

Your Database Session Table is wrong, your using the CodeIgniter 2.x Session Table.

This is the CodeIgniter 3.x Session Table:

PHP Code:

CREATE TABLE IF NOT EXISTS `ci_sessions` (
        `id` varchar(128) NOT NULL,
        `ip_address` varchar(45) NOT NULL,
        `timestamp` int(10) unsigned DEFAULT 0 NOT NULL,
        `data` blob NOT NULL,
        KEY `ci_sessions_timestamp` (`timestamp`)
); 


See your id field size...

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