I had 98 LP
Then I won one game, got into promos and lost 2 games. That lost me 38 LP, so 19 per game lost in promos. That's normal. However, if we count my 3 last games, then I lost 36 LP total (from 98 to 62). A win, loss, loss netted -36 LP. If we assume that a win and a loss cancel each other out, then a single defeat cost me 36 LP! That's of course due to the fact that I only gained 2 LP for the win since I was so close to 100. But should it be like that? One might expect that there would be some kind of hidden LP that would exceed 100 in order to prevent such situations. In promos your score is hidden anyway.