Opponent's Bishops Disappearing

Sometimes, in Live Matches, the image my opponents bishops will disappear. This usually happens immediately after they have been developed.The bishops can still be clicked on and highlighted, but the picture cannot be seen. I've only noticed this in 2|1 time control recently, but I haven't played any other time controls.

I've only started noticing it in my last two games. (I'll update this thread if it becomes a consistent event)

EDIT: Hasn't happenend for a few matches now so it doesnt seem to occur often.

Hopefully someone will be able to see this and take a look into it. If any other info is needed feel free to ask. Thanks for reading.

Sounds like cloaking.