Indesign 2014 CC, epub3-file Ipad good, but in Adobe Digital Editions bad

From Indesign I generated an epub3-file with the latest release CC 2014. The resulting ebook is splendid on an iPad . However, to my surprise the performance in Adobe Digital Editions is very poor. The text appears far to big on the screen and can not be reduced in ADE. Is this a problem of ADE or of Indesign? Those anyone knows a solution to tackle this?