Storing PHP Arrays in WordPress User Meta Database

You need to set the last parameter from false to true:

$wp_user_film_prefs_arr = get_user_meta( $wp_user_id, $wp_user_film_prefs_key_label, true );

That third parameter is $single:

(boolean) (optional) If true return value of meta data field, if false return an array.

Default: false

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