Take a look at this!

you've got a mail.

You find a bug.
#the_page .content div.thumbnailCategory div.description .text {
height:122px !important;
}
It will be removed in coming releases.

Anyway to solve it.

Activate and use LocalFiles Editor ([extension by Piwigo Team] LocalFiles Editor)

Select the CSS tab, Select local/css/Sylvia-rules.css
add the following code:

BODY #the_page .content div.thumbnailCategory div.description .text {
height:auto !important;
}