We can't see marketship setting on WooCommerce > Settings > Shipping > MarketShip
Plugin : hidden link
Then we asked to marketship plugin support team then they ask to us conflict with WPML String Translation plugin - if we disable WPML String Translation plugin that allows the MarketShip settings to appear on the admin side.
Thank you for contacting us. I am happy to help you.
As far as I can see the plugin you are mentioning is not in our compatibility list and maybe it has compatibility issues as you are describing. Maybe some compatibility code should be added to their plugin in order to be compatible with WPML.
I am encouraging you to invite Plugin Author to join our compatibility program, we are willing to help in this process of making their plugin WPML compatible: