Differnet sizes of thumbnails

On my homepage - www.gardennews.ch - you can see that at News Gallery in the sidebar and also on bottom 2 the Responsive Gallery are creating thumbnails with different sizes. I was asking this before but the given answer was not right.

If you take look with Firebug you can see that different thumbnail size are generated. But why ?

How can I fix this failure ?

Hi,
please try go to joomla.css and find (line 166)

Code: Select all

section img {
    height: auto !important;
    max-width: 100% !important;
}


and change it to:

Code: Select all

section img {
    max-width: 100% !important;
}