uninstalled 9 months back but still getting meta in some orders

Hello:

It has been over 9 months when we uninstalled the plugin and removed all instances of _woocs_order_* from all data tables from our DB. But now since 2 weeks we are again seeing this meta in our order details view for some reasons. Can you please help us in fixing this as this is creating a lot of meta entries which are useless for us since we do not use any currency switcher for the matter of using.

3142 matches in wp_postmeta
3576 matches in wp_woocommerce_order_itemmeta