Hi Sophie,
Sorry to hear you are experiencing difficulties.
If you don’t have WPML installed/activated (you can check this out by visiting your plugin admin screen) then that is almost certainly not going to be the cause.
Can I ask you to share a screenshot of the ticket settings (from within the event editor) – though you can’t directly upload files here, you can upload them to your own WordPress site/Droplr or similar and share the link here.
I’m particularly interested to know what your start/end sale dates are.
I tried de-activating woocommerce, it did not work.
WooCommerce must be activated for WooCommerce Tickets to operate, so yep let’s leave WooCommerce activated 🙂
Thanks and let me know how you get on!