It works OK for me. Could it be that you are typing too quickly?
Conditional lines
No. As the line I made an half hour ago was still there, now I tried to add a second line and again it saved it over the line I made previously.
Just post it here? I rather do not do that as the game is ongoing and I hope my opponent makes a mistake ;).
Not the conditional move itself - just the game. But you're right: better to send the link directly to chess.com via a support ticket.
I understood that, but even posting the game gives chance of people talking or my opponent giving the game a better look ;).
Where can I find those tickets :)?
Exactly at the place people don't look. Checked it another time, still doesnt work, tested it with another game, there it does still work and made a ticked.
Thanks.
I understood that, but even posting the game gives chance of people talking or my opponent giving the game a better look ;).
So you are adding conditional moves in our game,...
I'll better take a better look at it. 
Yes I tried to add all possible moves that you could make in your current position, with all possible reaction from my side. But the db didnt like it :(.
More seriously though I think it's because the first conditional move I made started with Bxc4 and the second with bxc4. So my hypothesis for now is that the computer doesn't make the distinction in this case between the capital and small letter, while in reality the first is with the bishop and the second with the pawn.
Did there change something? Normally I could make multiple conditional lines, however when I now click at a new line and finish it it saves it over the previous conditional line. :S.
So I really hope the game which I ten times tried to make a few conditional lines isn't messed up :(.