Vault Counter Stuck

Completed six time walking dungeons … all boses down. Vault counter stuck at four. Which is doubly odd becuase I received the weekly quest reward for completing five.

You need to do 8 dungeons. The Great Vault goes 2 / 4 / 8 to completely fill the dungeon row.

Vault counter being stuck at 4/8 might be just a visual bug. But yeah the 3rd reward is at 8

Quoting my response from another similar thread: