eupd formatting problems

I just compiled my first eupd ebook but some of the formatting is wrong (ie spacing and alignment). It is correct in the editor so do I need a another editor to make these corrections or can I correct them in scrivener

Eupd? Not epub…?

Sorry for the typo. Thanks for solving my problem.

In epub books, as in mobi books, it is mainly the reader software who determines the layout.

Thanks. I didn’t know that