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