Line Spacing in HTML Numbered List Conent

As part of a Report Design rendering run, I have some rich text data passed to the renderer. 
HTML is supplied in this format: 
 
<pre class='_prettyXprint _lang-auto _linenums:0'><ul><li style="text-align:left;">
Desc Num 1</li>
<li style="text-align:left;">
Desc Num 2</li>
<li style="text-align:left;">
Desc Num 3</li>
<li style="text-align:left;">
Desc Num 4</li>
<li style="text-align:left;">
Desc Num 5</li>
<li style="text-align:left;">
Desc Num 6</li></ul></pre>
 
On certain systems (Production!) the list is rendered with huge spaces between the items, but on other systems, the list appears correctly. 
 
Note: It is only the Numbered list that I see this rendering issue 
 
Image here of 2 rendering outputs, erroneous on left, correct on right <a class='bbc_url' href='http://i.imgur.com/Qid4V.png'>http://i.imgur.com/Qid4V.png</a> 
 
Any suggestions what direction I could take to resolve this appreciated. 
Ro

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Comments

kclark

Is the same browser used on the different systems? Also is the report being generated in the same format on each system or is one generating a PDF and the other HTML?

robilco

<blockquote class='ipsBlockquote' data-author="'kclark'" data-cid="112640" data-time="1356023810" data-date="20 December 2012 - 10:16 AM">
Is the same browser used on the different systems? Also is the report being generated in the same format on each system or is one generating a PDF and the other HTML? </blockquote>
 
I have no Browser in this scenario. This is all via Java Code, where the BIRT Engine is called from the Java API. 
I am executing a Web Service which returns an XML document. 
I'm binding elements of that document to fields in the Report Design and thus generating the PDF. 
 
In certain circumstances, the data returned from the Web Service is not a simple String, but contains some HTML. 
I've not done anything specific for this scenario, so am passing this HTML to the BIRT engine as if it were a String and it is maintaining its formatting on most systems. 
 
However, on certain systems the PDF generated has inserted spaces between each of the numbered items in the list.

kclark

Have you tried viewing a PDF that was generated with the spaces on a system that generates the report correctly? I'm wondering if it's a settings issue or an issue when the PDF is rendered.

robilco

<blockquote class='ipsBlockquote' data-author="'kclark'" data-cid="112647" data-time="1356025334" data-date="20 December 2012 - 10:42 AM">
Have you tried viewing a PDF that was generated with the spaces on a system that generates the report correctly? I'm wondering if it's a settings issue or an issue when the PDF is rendered. </blockquote>
 
PDF's are generated on headless Servers in a data centre to which I've no direct access, so not able to use that as a viewer. 
I've viewing both PDF's locally