Explanation
By default, the #LOGO_RUBRIQUE  tag displays the logo of the current section, and if not defined, will automatically search if a logo exists for the parent section recursively.
Usage
This behaviour can be disabled by customising the value of the constant in your config/mes_options.php (see the dedicated article).
// disable the inheritance of sections logos
define('_LOGO_RUBRIQUE_DESACTIVER_HERITAGE', true); 
See also
- The #LOGO_XXX tags
 - the complete list of constants and customisation variables in the glossary.