It's possible you are getting a fake warning/alert. Sometimes it is from Malware. You can run a FREE Malware scan. Just go to
www.freemalware.com - you will be offered to buy, but you can scan for free. I'm sure you will get suggestions from more savay computer people on here, but I used to get warnings on another site I used frequently and it was Malware. A nuisance - isn't it?!?!