It looks weird, but I think that it's no bug. Here is why:
1. You joined this game:
http://en.lichess.org/EVF6gMxq when your rating was 2092.
2. You left that game.
3. You joined a new game,
lichess.org/LG1y8KL6tdtV when your rating was still 2092. So it's displayed as such.
4. In the first game, that you left, your opponent claimed victory. You lost 7 rating points. **But this loss does not update the displayed rating at your second game. So it still displays 2092 there.**
5. You won the second game. You earned 7 rating points.
2092 - 7 + 7 = 2092