If you are getting notifications from ExcitingCentral, then your Mac is infected with adware. ExcitingCentral is adware for Mac.
ExcitingCentral changes setting in your Mac. First, ExcitingCentral installs a browser extension in your browser. Then, after ExcitingCentral 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.