All week Blizzard was making changes around Timewalking dungeons because of a bug that had appeared this week causing an excessive amount of experience to be gained from completing a Timewalking dungeon between the levels of 50-60.
Players were reporting numbers of 300k from one dungeon which was enough to complete a whole level in one run.
After the nerfs it was returned to 80k, a substantial difference, which caused players to stop queuing for the weekly event.
World Of Warcraft: Shadowlands Hotfixes Buff Timewalking Experience
During a hotfix late Friday, Blizzard announced plans to increase Timewalking dungeon experience from completion by 50%.
Developers’ note: "There was a bug introduced in 9.1 that caused Timewalking to give much more completion experience than the UI advertised, ramping up more the lower-level the base expansion was, which is why this wasn’t noticed with Warlords of Draenor Timewalking a few weeks ago. The intent is for all Timewalking weeks to give comparable experience – we put in a quick fix last night and have deployed the proper fix today. We also took the opportunity to recalibrate Timewalking experience and increase it".
Now the bug seems to be fixed, and each expansion event will give roughly the same rewards.
This week's Burning Crusade Timewalking will end with the weekly reset, and Timewalking itself will not be available again until August 31st, where Wrath of the Lich King dungeons will be available alongside the iconic Ulduar raid.