Why did ATEEZ sell 300k less than their previous album?

Why did the sales for Ateez decline that much in such a short time? Is the sales boom kpop has been experiencing slowly coming to an end? Ateez were looking to be million sellers in their next comeback but it didn't happen. No one has even talked about this occurance anywhere.

Discuss

Someone did this thread last week. It's cause Fever Epilogue is not a proper comeback, It's kind of a compilation of korean versions of their japanese songs and studio versions of their performances on Kingdom. Even the title track is not a new song, they released back in June.