It's possible that you've got viruses or malware installed on your device or another device that's using the same Internet connection. Please check your computer for compromises. If you're running an anti-virus program, make sure it's up to date. Once you've removed any virus, malware, or spyware, it could take a few days for our system to update, so please be patient.
Need a good anti-virus program? Check Google's favorite picks:
https://www.google.com/safetycenter/everyone/cybercrime/devices/