Hi,
Thanks for fast reply. Unfortunately I am not allowed to share our store yet which I know will limit your ability to help. Sorry for this.
We ar using Woodmart theme and latest version of your plugin, so they should be compatible according to documentation. Also, the issue exist using only Woocommerce plugin and your plugin, all other plugins deactivated for debug purposes.
I am just wondering if anyone have experienced something similar and have some tips on what could be the cause for us to try.
Thanks.