Footnote and paragraph recovering

Hi,

I have a problem with my XSL-Fo transformation when I declare more than 3 or 4 footnote in the same page. My paragraphe write over my footnote.

I use Norman Walsh docbook.xsl/fo , docbook XML 4.12 , XsltProc for Windows and Fop 0.20.5

See my attach file

Thank you

Eric