problem with products module

[Mandig]

Hi, I have a pagination problem with the products module (best sales, featured, etc.): even changing values of products per raw in backend nothing happens and I just can see 1 item per line.
I thought it was a template problem because I'm using a custom one but even using the default VM template inside Joomla's Beez template the problem remain.

Any idea about how can I solve this?

Many thanks in advance.

[attachment cleanup by admin]

[Mandig]

Anyone who can help me with this?