I cannot see my knights!!!

I just played a game and my knights appeared to be missing. However, my opponent could see them and when I clicked on where they should be I was able to "move" them but they were invisible to me.

I had this issue when I played using Microsoft Edge. I don't think it occurs on other browsers like Firefox or Chrome.

This happened to me in Firefox. Refreshing the page didn't fix it but restarting the browser did.