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