[Ptop]

I finally got my book uploaded in the Kindle format and it looks great. Our local library wants it, but they can only do it in epub format. So, I tried converting my mobi generated file to the epub format using Calibre. I uploaded to Pubit and looked at it on the Nook and many photos are repeated, the formatting is odd and some of the text runs over the photos.
I tried downloaded the html from Pubit and it sure wasn't html, just a bunch of gobblety-gook. So, I took the file and opened it in Sigil to see how it looked and everything was fine and formatted correctly.
Also, the links don't work. I noticed that there is a single apostrophe around the links. (They work fine on Kindle.)So, what the heck is going on?
Is there something that I am missing?

Any help or suggestions greatly appreciated