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