Variations issue

I am working on a site http://gc.kenkar.com.au/, the products have multiple variations. Everything is updated, and using the Avada theme. There are currently 6 products of 53 not working as expected.

on one product http://gc.kenkar.com.au/product/spigot-tees-long-3/ looking at the source with developr tool I see data-product_variations="false" and all the variations show for both options

on another http://gc.kenkar.com.au/product/45-degree-spigot-elbows-long-3/ the developer inspector data-product_variations shows an array and the second option shows different variations according to which option is selected on the first variation. As wanted.

### WordPress Environment ###

Home URL: http://gc.kenkar.com.au
Site URL: http://gc.kenkar.com.au
WC Version: 2.6.4
Log Directory Writable: ✔
WP Version: 4.4.1
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ✔
Language: en_US

### Server Environment ###

Server Info: Apache
PHP Version: 5.6.24
PHP Post Max Size: 32 MB
PHP Time Limit: 0
PHP Max Input Vars: 1000
cURL Version: 7.36.0
OpenSSL/1.0.1e

SUHOSIN Installed: –
MySQL Version: ❌ 5.5.50 – We recommend a minimum MySQL version of 5.6. See: WordPress Requirements
Max Upload Size: 32 MB
Default Timezone is UTC: ✔
fsockopen/cURL: ✔
SoapClient: ✔
DOMDocument: ✔
GZip: ✔
Multibyte String: ✔
Remote Post: ✔
Remote Get: ✔

### Database ###

WC Database Version: 2.6.4
:
woocommerce_sessions: ✔
woocommerce_api_keys: ✔
woocommerce_attribute_taxonomies: ✔
woocommerce_downloadable_product_permissions: ✔
woocommerce_order_items: ✔
woocommerce_order_itemmeta: ✔
woocommerce_tax_rates: ✔
woocommerce_tax_rate_locations: ✔
woocommerce_shipping_zones: ✔
woocommerce_shipping_zone_locations: ✔
woocommerce_shipping_zone_methods: ✔
woocommerce_payment_tokens: ✔
woocommerce_payment_tokenmeta: ✔
MaxMind GeoIP Database: ✔

### Active Plugins (11) ###

Gravity Forms: by rocketgenius – 2.0.6
LayerSlider WP: by Kreatura Media – 5.6.6
cPanel & WHM® Site Software: by cPanel
Inc. – 1.0

Download Manager: by Shaon – 4.4.0
Fusion Core: by ThemeFusion – 2.0.3
Gravity Forms Campaign Monitor Add-On: by rocketgenius – 3.4.1
Slider Revolution: by ThemePunch – 5.2.5
Snapshot: by WPMU DEV – 2.5.0.1
UpdraftPlus – Backup/Restore: by UpdraftPlus.Com
DavidAnderson – 1.12.17

WooCommerce: by WooThemes – 2.6.4
WooThemes Helper: by WooThemes – 1.6.2

### Settings ###

Force SSL: –
Currency: AUD ($)
Currency Position: left
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2

### API ###

API Enabled: ✔

### WC Pages ###

Shop Base: #48 – /products/
Cart: #53 – /cart/
Checkout: #54 – /checkout/
My Account: #55 – /my-account/

### Taxonomies ###

Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### Theme ###

Name: Avada Child
Version: 1.0.0
Author URL: https://theme-fusion.com
Child Theme: ✔
Parent Theme Name: Avada
Parent Theme Version: 4.0.3
Parent Theme Author URL: http://themeforest.net/user/ThemeFusion
WooCommerce Support: ✔

### Templates ###

Overrides: Avada/woocommerce/cart/cart.php
Avada/woocommerce/checkout/form-pay.php
Avada/woocommerce/checkout/review-order.php
Avada/woocommerce/checkout/thankyou.php
Avada/woocommerce/loop/loop-start.php
Avada/woocommerce/single-product/add-to-cart/variable.php
Avada/woocommerce/single-product/add-to-cart/variation-add-to-cart-button.php
Avada/woocommerce/single-product/product-image.php
Avada/woocommerce/single-product/product-thumbnails.php
Avada/woocommerce/single-product/short-description.php
Avada/woocommerce/single-product/tabs/additional-information.php
Avada/woocommerce/single-product/tabs/description.php

Suggestions would be welcomed.
Ernie

https://wordpress.org/plugins/woocommerce/