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3 hours ago, ndiaga said:

It  is   because  the  logo  of  the  manufacturer  is  named  differently   in your  shop   you  don't    small_ default-id.jpg    but  just  id.jpg  

This   code  is  working

<a href="index.php?id_manufacturer=72&amp;controller=manufacturer&amp;id_lang=2">
                Cimco 				
                <img src="https://shop.electro-instalatii.eu/img/m/72.jpg" alt="Cimco" title="Cimco">
</a>

  

So   just  remove  the   small_default-    in  here  :

<a href="index.php?id_manufacturer=21&amp;controller=manufacturer&amp;id_lang=2">
                ElektroP 				
                <img src="https://shop.electro-instalatii.eu/img/m/21-small_default.jpg" alt="ElektroP" title="ElektroP">
 </a>

If   you  leave  only  21.jpg   it  will  work.

Thank you for your patience .
I did what you said, but the same problem arises