Epub to Epub losing Justify text alignment

[navyo]

Hi There, I have an ePub created in iBooks Author with all text justified. Converting in Calibre (with new cover), even though CSS still reads "text-align: justify;" it appears ragged right in the Calibre Viewer and in iBooks.

Here is my process:

Import ePub with justified text
In Calibre Edit panel - CSS reads "text-align: justify;" in all instances but viewer shows rag right
Export to ePub - output panel text align = original
View in iBooks - text align is rag right
Export to ePub - output panel text align = justify
View in iBooks - text align is still rag right
Export to ePub with Extra CSS "text-align: justify;"
View in iBooks - text align is still rag right
Import the newly exported ePub and Export to ePub again - output panel text align = justify
View in iBooks - text align is still rag right

Any ideas as to how I can solve this would be most welcome.
Thanks in advance.
Navyo