Woocommerce check out pages mixes site languages in the order confirmation pages

I am running WordPress 4.9.5. I am using Polylang 2.3.4, Woocommerce Polylang integration version 0.2, Hyyan WooCommerce Polylang Integration 1.0.4 and Woocommerce 3.3.3.

The primary site language is Finnish and the second language is English. If I update from Woocoomerec 3.3.3 to Woocommerce 3.3.4 or 3.3.5 and an order is placed in English, the personal information of the customer in the order is in English BUT the order details and conditions are in Finnish. The order is also stored in the Finnish part of the site instead of the English side. If the order is placed in the Finnish language everything is normal.

If I return to Woocommerce 3.3.3 after the update everything works like it should. The site is using Woocommerce 3.3.3 at the moment but I can update to 3.3.4 or 3.3.5 if somebody would like to take a look at the site.

Can somebody help me or advise me please? Has anybody else experience a similar problem with Woocommerce 3.3.4 or 3.3.5?

This problem is the same regardless of the browser used Firefox, Chrome, Internet Explorer, Safari.

Pat