20% XP loss...bug or feature?

[Fester Adams 8]

Killed a dwarf that trained my Nuker. Got red. Let myself kill by a mob. Lost 20% XP---> more loss when killed as chaotic char or bug?

[San0 2408]

if you deleveld the % you loose is higher becus the ammount of exp you loose is related to the level you were before the death.

[Narmontas 34]

san0 sometimes it goes like random... Ive lost many many times 10% xp sometimes 12% (AT SAME LEVEL) and one time i had -22% xp loss. at same 23 lvl...