Query Limits broken in 2.5.15
From Joomla! Documentation
Revision as of 16:18, 6 November 2013 by Wilsonge
Modules that involve selecting a limit number of articles in Joomla 2.5.15 ignore their limit.
What is the cause
This is because a sanity check was backported into J2.5 from J3.x that didn't function correctly.
How to fix
If you haven't upgraded already, please wait as 2.5.16 will be released soon to fix this. Else apply the fix in this patch: https://github.com/joomla/joomla-cms/commit/6d185fb36261a8e4c14aca7507d3fde8e6ad1769