If you are getting notifications from LatestFeed, then your Mac is infected with adware. LatestFeed is adware for Mac.
LatestFeed changes setting in your Mac. First, LatestFeed installs a browser extension in your browser. Then, after LatestFeed hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.