different behaviour in reading docx after saving it with LibreOffice

Hello,
I have a simple docx example file generated with docx4java, containing a table.
It’s ok when I open it with Office (200 and 2007). If I open it with LibreOffice, the table borders go over the page width right limit.
But if I save the wrong visualized docx with LibreOffice in Word 2007/2010 XML format and later I reopen it with Libreoffice, the table is well formatted within the page limits.
Is this a bug ? Have I to submit it ? Why this different behaviour ?
I can attach the document but I have no enough karma

It sounds to me like docx4java is not writing out well-formed OOXML. Please edit your question to include a link to an example attachment. Thanks.