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