Models and Auto Increment ID issue

Hi

When I submit a form on the front end on a new custom table the first entry created takes the next post id and does not start from an ID of 1, why is this?

$meta_boxes[] = [
	'title'       => 'Test',
	'model'       => 'example', 
	'storage_type'=> 'test'
	'table'       => 'wp_test',
	'id'          => 'test',
	'fields'      => [
		[
			'id'    => 'product_name',
			'type'  => 'text',
			'name'  => 'Product Name',
		],
	]
]

MB_Custom_Table_API::create( 
	"{$wpdb->prefix}" . 'test', 
	[
		'user_id' => 'BIGINT(20)',
		'data' => 'TEXT NOT NULL', 
		'iv' => 'VARCHAR(50)', 
	],
	['user_id'],
	true // Must be true for models
);