xsl-fo: table cell border width inconsistency

Hello,
   border-width for table cells in xsl fo seems to
work fine as long as it is greater than 0.8pt. Once I
start decreasing say for example 0.5pt, then the
border width becomes inconsistent in all the rows. Has
anyone seen that problem ?

I tried using px instead of pt, but still the problem
exsists.

Any help will be appreciated.

Thanks.
Mark

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