many reasons!
-bcose ayu aint as popular as bfore (secret didn't sell that much anyway too, lucky that it got 1st place)
-bcose the album didnt look that promising (the covers were boring for an album, just like any random fashion magazine)
-it didn't have enough songs I think
-maybe the name of the album scared people (who knows lol)
-other singers released in the same date
-the news of her hearing problems
-etc etc etc
but well, lets b positive!
her next album must b better ^^