Bug on analysis board?

I just started to analyse this puzzle: http://de.lichess.org/training/opening/4149
and put Nxe7 on the board. But on Qxe8 the queen jumped back, so I repeated (this sometimes happens with lag), but then I got this: http://www.fotos-hochladen.net/view/puzzle4149analy8t5rkh7ly0.png

In Opera as in Firefox. Anyone else, who observes the same weird behavior?

And by the way: the puzzle is stupid ;(

I have been able to recreate the result. The same thing happens in Opera and also Chrome. Seems that the puzzle/analysis board is glitched.

The problem is the opening-analysis button, it links the FEN but it ends with _1_0 which is a halfmove but whites turn?

I also just noticed, that the "first" move is noted with 0 (zero)! Other puzzle start with the actual move number from the game. Perhaps thats the reason.

#5 yes, that is more correct. The problem is when the FEN string URL ends with 0, reproducible by trying to play any two moves http://en.lichess.org/analysis/2rq1rk1/pb1nbppp/1p1p1n2/3Np3/P1B1P3/1P3N2/2P2PPP/R1BQR1K1_w_-_-_1_0

It works fine if one chops of the last numbers like this http://en.lichess.org/analysis/2rq1rk1/pb1nbppp/1p1p1n2/3Np3/P1B1P3/1P3N2/2P2PPP/R1BQR1K1_w_-_-

Fix ready, will roll it out in a few hours.

Works like a charm now, great work once again, thanks :)