I asked myself the same question too, and my friend told me the GM lowered the quest rewards because of the high level spike :X

Quest experience was adjusted quite a lot in a recent update because some of them were set ridiculously high but it's quite possible I missed some or made some mistakes with the numbers.

I also reduced the amount of EXP required to level from 65-85 considerably so it shouldn't be necessary to give such huge experience from quests.

The quests you are referring to. Are they all normal quests from NPCs? Or Wanted Papers?

the main quest also 20m not only the daily quest, well i try did all the quest at UH, main, daily, WP, but the exp to low, i even didnt lvl up to 66 after doing all the quest there,
maybe im lazy, but it is hard for new player out there

doing the daily quests and new quests in these areas is terrible. @ 67 im getting maybe 1% per quest. If you do wanted papers and magic tower that can net you bout 50% a lvl per day which isnt bad. but doing the dailies themselves rather seems pointless atm

Mobs in UH and NFS have x3 higher HP than than the mobs in Corrupt Valley. The rewarded exp isn't even relative anymore to the level. One time Map Quests in Corrupt Valley and Night forest give about x3 or more than UH Quests.

Its so sad that you work harder for less exp for doing higher level quests but not just UH Map Quest, even the WGH dungeon quests gives about 20-21m ea.

The 2 WGH daily quests actually gives slightly higher exp than the one time quest at 21m+1m if you want exp reward.
Killing Gerry x10 will just net you 21m exp just the same.

The Exp given by a level 60 WGH dungeon quest is almost the same as the dungeon quests for a Level 40 Laioha Hard dungeon.
Level 50 DH gives way better exp.

Hope these Quests get fixed in the future. Please check and adjust the values.

Working on this at the moment for the next update.

I went through all of the quests last night and made a lot of adjustments - too much to mention here but basically all of the quests after Corrupt Valley have been increased as well as a lot of lower level quests that had too low rewards set.

Quests between level 65 and level 85 now give between 75,902,040 and 97,500,000 EXP/SXP.
Quest completion per level from 65-85 ranges between 12 and 18 normal quests, less if you do dungeon or elite quests or Magic Tower.

UH, CS, NFS, PI, SD, PC, WGH, CH quests increased experience increased in line with the quests before them.
Dungeon quests (including dungeon Wanted Papers) give double the reward of normal quests of the same level.
Wanted Papers of all levels increased in line with normal quests of the same level.
Wanted Papers with Elite targets (Collossus Shadowfields elite monsters) give double rewards and an extra badge.

I'll update sometime this week. Hopefully within the next day or two.