wordpress settings api add fields

You’re passing the same ID to every single setting of a given type, rather than passing the $setting to the callback. Have a look at how I implement this type of callback in Oenology.

function oenology_setting_callback( $option ) {
    $oenology_options = oenology_get_options();
    $option_parameters = oenology_get_option_parameters();
    $optionname = $option['name'];
    $optiontitle = $option['title'];
    $optiondescription = $option['description'];
    $fieldtype = $option['type'];
    $fieldname="theme_oenology_options[" . $optionname . ']';

    // Output checkbox form field markup
    if ( 'checkbox' == $fieldtype ) {
        ?>
        <input type="checkbox" name="<?php echo $fieldname; ?>" <?php checked( $oenology_options[$optionname] ); ?> />
        <?php
    }
    // Output radio button form field markup
    else if ( 'radio' == $fieldtype ) {
        $valid_options = array();
        $valid_options = $option['valid_options'];
        foreach ( $valid_options as $valid_option ) {
            ?>
            <input type="radio" name="<?php echo $fieldname; ?>" <?php checked( $valid_option['name'] == $oenology_options[$optionname] ); ?> value="<?php echo $valid_option['name']; ?>" />
            <span>
            <?php echo $valid_option['title']; ?>
            <?php if ( $valid_option['description'] ) { ?>
                <span style="padding-left:5px;"><em><?php echo $valid_option['description']; ?></em></span>
            <?php } ?>
            </span>
            <br />
            <?php
        }
    }
    // Output select form field markup
    else if ( 'select' == $fieldtype ) {
        $valid_options = array();
        $valid_options = $option['valid_options'];
        ?>
        <select name="<?php echo $fieldname; ?>">
        <?php 
        foreach ( $valid_options as $valid_option ) {
            ?>
            <option <?php selected( $valid_option['name'] == $oenology_options[$optionname] ); ?> value="<?php echo $valid_option['name']; ?>"><?php echo $valid_option['title']; ?></option>
            <?php
        }
        ?>
        </select>
        <?php
    } 
    // Output text input form field markup
    else if ( 'text' == $fieldtype ) {
        ?>
        <input type="text" name="<?php echo $fieldname; ?>" value="<?php echo wp_filter_nohtml_kses( $oenology_options[$optionname] ); ?>" />
        <?php
    } 
    // Output the setting description
    ?>
    <span class="description"><?php echo $optiondescription; ?></span>
    <?php
}