[jQuery] jQuery Interface Sortable: loosing the style of dragged item

[NiKo]

Hi,

I'm quite a newbie and I'm using jQuery 1.12 and interface 1.2
(interface.eyecon.ro) and I have a strange behavior on my sortable
elements : the divs I drag have no style applied to, the style comes
back when I stop dragging them.

Here's my code :

$('#ph_columns td.sortable').Sortable(
                {
                        accept:      'portlet',
                        helperclass: 'ph_sort_placeholder',
                        handle:      'div.portlet-header',
                        opacity:     0.9,
                        tolerance:   'intersect'
                }
);

Can you see someting wring here ? Here the divs of class 'portlet'
will see the corresponding css style not be displayed when dragged.

Thanks in advance for your help :)