Thanks for reaching out. It's possible that the filter
guardian's work would do the trick, but it doesn't sound like that's
the main issue. In this case, I would run a malware scanner to see if something adjusted the settings without your permission. Malwarebytes has a solid reputation and a free version for both Windows and Macs.
If you would like our direct assistance, then please call us at 877-479-1119. We can help you with the malware scanner and provide additional help.