Hi Michael
This will be due to a font problem.
When using live text in your fixed layout EPUB pages, the fonts are ’embedded’ – so placed inside the EPUB file for use by the ebook reader.
If you have used one or more font which can’t be embedded for any reason then the text will still start in the correct position but it will be shown in a substituted font that is available to the ebook reader. In your case the default font is wider than your original font so it gives the impression that spacing has disappeared and the words are joining together.
Reasons why fonts may not be embedded:
1. You are using a font format such as PostScript Type 1 which is not supported by EPUB.
2. Your fonts are not active at the time of making the EPUB.
3. You are using fonts that have restrictions which disallow themselves being embedded.
Try a free trial of CircularFLO https://www.circularflo.com to get around this problem and reply here or via https://www.circularsoftware.com/contact/ for further help.
Good Luck!
Thanks
Ken Jones
Circular Software