Classes from a deleted symbol cannot be deleted even after the symbol is unlinked and deleted and the elements on all pages are deleted. For example: I'm not using the class "Form Wrapper" anymore, yet Webflow detects it on 13 pages.
Also Webflow detects instances of a class which aren't available anymore. example:
I have 14 "nav link"s in one page only. Webflow says I also have 303 "nav link"s on other pages, which is not true.