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