A problem with Facebook traffic

Hello everyone.

I’ve stumbled upon a problem. Around a week ago, traffic from Facebook skyrocketed almost 10 times on our website. Traffic is mostly from Sweden, Ireland, the USA,. Our site is Russian and promoted in Russia. It has nothing to do with the regions mentioned above. Our computers were checked for viruses, and zero were found. VPN Was not enabled as well.

Could you please help me deal with it?