If you are referring to the child theme, to edit something, you will need to copy the file you want to change from parent to child, and edit inside the child the file you copied. if the file was inside folders in the parent , you must create empty folders in the child theme folder to match those of the parent and drop the file into the same level of the folder structure of the child so it would match the parent's.
I can't tell for sure. Could be your cache. Have you emptied it? Could be your server cache. Could be a plugin. When you use notepad++ to search, please remember capitalization counts, and try not to search for the entire phrase, because often a phrase is dynamically created.
The setup you should have when searching with notepa++d is: 1 folder, inside which you have
a) parent theme folder
b) child theme folder if you have it
c) folder containing all the plugins on your website. So when you search for something using Notepad++, both the theme folder and subfolders are searched (by the way that's an option that should be checked yes on notepad++), and all your plugins are also searched.
Have you tried searching in the WooCommerce support forum, they have a huge community, because I never encountered this before.