Anyone else lost points while shielded?

And I'm not talking about other players already attacking me before I shielded.

I shielded around 2 hours ago when my score was around 520++ for Hotshot. I came home and open up my tablet and got a notice to say I was attacked while shielded, it showed +0 and that the attacker got 21 points off me. My score is now 503. I don't see any of the 3 nodes being red in color.

Earlier for HPK my score also fluctuated a bit, maybe within threshold of +-5 while shielded. Is it just the server not showing proper scores in realtime?