By reputation graph I mean the graph that's below the Reputation link (only if you have rep changed in the last week or something like that).
Display lost/negative reputation on reputation graph
Right now the reputation graph looks like that it only displays the positive achievements and does not display negative reputation changes. It shows the negative rep (not displays) when you hover over the date you lost reputation.
If the user did not hover over the dates he/she might get confused and think the rep didn't change for that user on the date he/she actually lost reputation.
Maybe it then should look like this (ignore the reputation changes shown):
If it doesn't fit, just add some space.