Content Module Joomla 3 and Firefox

I found what i think is a bug because only happens in firefox. With the content module enabled the first view shows perfect. After refreshing two or three times it brokes and some products are displayed in several position leaving white spaces, you can take a look in www.oviedocomercio.es .
Now the module is inside nonumber tabs and using nonumber modules anywhere, but i also tried with the module alone without being anywhere.
Can you find a fix please?

Hi,

I am sorry but it is not a bug in HikaShop or a bug in Firefox.
Just a CSS problem. Some product titles are displayed in two lines and other in one. But your "min-height" is too low (45px).
Change it to 60px and you will see a little difference

Regards,