I met an issue when using gift wrap of M2. I added gift wrap in Shopping cart, then I disabled that gift wrap in Admin but it's still showing and applying amount into cart like the below image.
It's the default Magento
After making any changes in store configurations you should clear your cache from admin (System->Cache Management->Flush Cache ) / CLI ( php bin/magento cache:flush )
However if you are in default mode ( to check run command php bin/magento deploy:mode:show ). Then give a try by deploying static content ( php bin/magento setup:static-content:deploy -f ) again and flush cache.