[xsl] copy-of operation removes spaces at random

[Michael Webster <mwebster@xxxxxxxxxxxxxxx>]

I'm looking at an XSL that copies an XML document and puts in parts as 
needed to update the XML from an old version to a new version.

For some reason, in seemingly random locations, spaces between words are 
removed:

<definition>Human creatine kinase M mRNA, complete cds.</definition>

becomes

<definition>Human creatine kinase M mRNA,complete cds.</definition>

or 


<definition>Hs#S1726344 Homo sapiens basonuclin (BNC), mRNA</definition>

becomes

<definition>Hs#S1726344Homo sapiens basonuclin (BNC), mRNA</definition>


The XSL that is doing this operation is simply:

<xsl:copy-of select="pd:oligoList"/>


I was wondering if anyone else has run into this sort of thing?