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