Did it say verifying if you're human? If so that's just an occasional security check on some sites and occasionally on here. Do you use a VPN? Or just switched to a different device?
If it literally said are you a robot and you had to click no then that's not to do with this site - would suggest you check web browser extensions as these can be hijacked and do unusual pop ups. And clear cookies.
A security check would say verify you're human or "I am not a robot" and you just click. But it wouldn't have a "no" to click.