Wordpress 4.5.2
Piklist 0.9.9.8
Everything works fine except for Servings and Skill not saved. Thanks in advance for the help.

<?php
/*
Title: Recipe Details
Post Type: post
Order: 1
*/
piklist('field', array(
  'type' => 'text'
  ,'field' => 'youtube_embed'
  ,'label' => 'Youtube Embed'
  ,'attributes' => array( 'placeholder' => 'https://www.youtube.com/embed/vGuIdi__4kY' )
  ,'columns' => 12
));

piklist('field', array(
  'type' => 'text'
  ,'field' => 'prep_time'
  ,'label' => 'Prep Time'
  ,'attributes' => array( 'placeholder' => '30 min' )
));

piklist('field', array(
  'type' => 'text'
  ,'field' => 'cook_time'
  ,'label' => 'Cook Time'
  ,'attributes' => array( 'placeholder' => '1 hr 30 min' )
));

piklist('field', array(
  'type' => 'text'
  ,'field' => 'servings'
  ,'label' => 'Servings'
  ,'description' => 'Example: 4 pax'
  ,'attributes' => array( 'placeholder' => '4' )
));

piklist('field', array(
  'type' => 'select'
  ,'field' => 'skill'
  ,'label' => 'Skill'
  ,'description' => 'Choose difficulty level'
  ,'choices' => array(
    'Easy' => 'Easy'
    ,'Intermediate' => 'Intermediate'
    ,'Hard' => 'Hard'
  )
));

  piklist('field', array(
    'type' => 'text'
    ,'field' => 'ingredient'
    ,'add_more' => true
    ,'label' => __('Ingredients')
    ,'description' => 'Add more ingredients using the plus button'
    ,'columns' => 12
  ));

  piklist('field', array(
    'type' => 'text'
    ,'field' => 'instruction'
    ,'add_more' => true
    ,'label' => __('Instructions')
    ,'description' => 'Add more steps using the plus button'
    ,'columns' => 12
  ));