I've been farming Wendigo for the last few days. Finally got the final blows done, and was at 480+ on multikills.
After logging back in after the maintenance message, the quest now reads:
Grenade final blows: 484 (previously completed, 1500+)
Grenade multikills: 500 (previously 480+, presumably these are switched)
Points gained: ZERO (yes 0%), previously about 68%
This is entirely unacceptable. I sincerely hope the variable swapping that clearly occurred didn't change the variable range and this is fixable - and the percent progress has always been the longest step. I have no intention to farm this again.
PC, battle tag is Varner#1912