Problem with my Cloudflare

Recently I’m getting the following email message periodically,

A lockdown event has occurred due to too many failed login attempts or invalid username:
Username: admin
IP Address: 84.236.11.90

IP Range: 84.236.11.*

Log into your site’s WordPress administration panel to see the duration of the lockout or to unlock the user.

For this reason I add my site on cloudflare.

Some days later I faced another problem,

When I post something in my site, there if I add a featured image, then publish I couldn’t see this image. Moreover, when I share this post on Facebook I saw this MSG,

Attention Required! | CloudFlare

If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.