A piece turned invisible

Hi all,

Just wanted to report a minor glitch that happened during one of my games (lichess.org/CcQCuA2uQKGa).

For some reason, from the moment my opponent played 11.Qe2 that queen became invisible, even after several moves (including 14. Qxe4, in which the queen moved again).

I was using Firefox and restarting it didn't solve this, changing browsers did, in any case.

Thanks!

ninja queen!!

kinda weird, my pieces don't turn invisble unless i set blindfold!