In my last game, Lichess started to lag and moves didn't seem to register, so I tried to make the move again. But I made a capture with K instead of R tried earlier. Lichess lagged some more, then it probably made at last the first move and the R from the first move found itself over the K from the second try and deleted it.
(I have a screen capture, but I don't know how to add it to this post)
(I have a screen capture, but I don't know how to add it to this post)