I had also the same issue, but I got the answer already, so i'll share it with you.
Their monitor is working without any issues right now. Your server isn't responding to ping, and the traffic is being dropped from outside of the iClan Website's datacenter
That's being said, your server has probably an firewall blocking their probe server from reaching your BF4 server.
This is not really an bug, but opening an support ticket, will help you by getting answer to this faster.