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It started recently, so not sure what has caused it. Could be WPML I guess.
Here is the system status log, we had both WMPL and the pdf invoice from the date we launched the site. Which was over a month ago I believe.

### WordPress Environment ###

Home URL: https://www.liquido-fashion.com
Site URL: https://www.liquido-fashion.com
WC Version: 2.6.14
Log Directory Writable: ? Om loggen mogelijk te maken
maak /var/www/vhosts/54/228131/webspace/httpdocs/liquido-fashion.com/wp-content/uploads/wc-logs/ schrijfbaar of definieer een custom WC_LOG_DIR.

WP Version: 4.7.3
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: nl_NL

### Server Environment ###

Server Info: Apache
PHP Version: 7.0.7
PHP Post Max Size: 50 MB
PHP Time Limit: 0
PHP Max Input Vars: 5000
cURL Version: 7.36.0
OpenSSL/1.0.1e

SUHOSIN Installed: –
MySQL Version: ? 5.5.46 - Wij adviseren een minimum PHP-versie 5.6. Bekijk: WordPress Benodigheden
Max Upload Size: 50 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 2.6.14
: 
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 (40) ###

All-in-One WP Migration: door ServMask – 6.42
Capability Manager Enhanced: door Jordi Canals
Kevin Behrens – 1.5.7

Contact Form 7: door Takayuki Miyoshi – 4.7
Custom Related Products for WooCommerce: door Scott Nelle – 1.2
Disable Author Pages: door Frank Staude – 0.11
Disable Comments: door Samir Shah – 1.6
Enhanced E-commerce for Woocommerce store: door Tatvic – 1.0.19
Enhanced Media Library: door wpUXsolutions – 2.4.4
Fusion Builder: door ThemeFusion – 1.0.6
Fusion Core: door ThemeFusion – 3.0.6
MailChimp voor WordPress: door ibericode – 4.1.0
WooCommerce Product Filter (shared on wplocker.com): door Mihajlovic Nenad – 4.0.4
Protect WP-Admin: door MR Web Solution – 2.5
Relevanssi: door Mikko Saari – 3.5.8
WooCommerce Sisow Betaal Opties: door Sisow – 4.7.0
WPML Multilingual CMS: door OnTheGoSystems – 3.6.3
The Events Calendar: door Modern Tribe
Inc. – 4.4.4

Woo Autocomplete Search Bar: door Gabriel Alfaro – 1.3
WooCommerce Print Invoice & Delivery Note: door Triggvy Gunderson – 4.1.5
WooCommerce EU VAT Number: door WooThemes – 2.1.14
WooCommerce MailChimp: door Saint Systems – 2.0.20
WooCommerce Multilingual: door OnTheGoSystems – 4.1.2
WooCommerce PDF Invoices & Packing Slips: door Ewout Fernhout – 1.5.39
WooCommerce Product Slider: door subhansanjaya – 1.2.1
WooCommerce Sequential Order Numbers Pro: door WooThemes / SkyVerge – 1.10.1
WooCommerce Stock Manager: door Vladislav Musílek – 1.1.4
WooCommerce - Store Exporter Deluxe: door Visser Labs – 2.2.2
WooCommerce: door WooThemes – 2.6.14
WooCommerce Helper: door WooCommerce – 1.7.2
WordPress Importeerder: door wordpressdotorg – 0.6.3
Yoast SEO: door Team Yoast – 4.4
WP Rocket: door WP Media – 2.9.8.1
WPML All Import: door OnTheGoSystems – 2.0.3
WPML CMS Nav: door OnTheGoSystems – 1.4.19
WPML Media: door OnTheGoSystems – 2.1.24
WPML Page Builders: door OnTheGoSystems – 1.0.0
WPML Sticky Links: door OnTheGoSystems – 1.4.0
WPML String Translation: door OnTheGoSystems – 2.5.2
WPML Translation Management: door OnTheGoSystems – 2.2.7
WPML Widgets: door Jeroen Sormani – 1.0.6

### Settings ###

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

### API ###

API Enabled: ?

### WC Pages ###

Winkelbasis: #12 - /winkel/
Winkelmand: #13 - /winkelkarretje/
Afrekenen: #14 - /afronden/
Mijn account: #15 - /mijn-account/

### Taxonomies ###

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

### Theme ###

Name: Avada
Version: 5.0.6
Author URL: https://themeforest.net/user/ThemeFusion
Child Theme: ? – Als je wijzigingen aanbrengt in WooCommerce of in een hoofdthema dat je niet zelf gebouwd hebt
raden we het gebruik van een subthema aan. Zie: Hoe maak je een subthema

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

### Templates ###

Scheduled Export to FTP: ?
Scheduled Export to SFTP: ? The required SFTP functions are not available

Hi, thanks for replying.
No we are not using sendcloud. Here are the plugins we are using.
Note: not all of them are active.

https://prnt.sc/en1sz8
https://prnt.sc/en1t4u
https://prnt.sc/en1ta6

Hope this helps :/