Can't change banner

I changed the custom CSS to make the banner on my site (http://sarongtoko.yolasite.com) smaller but now for some reason I can't change it anymore. I can add a new picture and crop it and it shows up fine but when I publish it I just see a picture of the previous banner and then when I go back to the sitebuilder I see that the banner has also changed to the previous one. When I crop the image I see the new picture but then the whole process just repeats itself.
Is this a bug? or is it something in my custom CSS?

Custom CSS:
div.header_divider {
background:url(http://s1.yolacdn.net/V0023898/templa...) repeat top center transparent;
_behavior: url(http://s1.yolacdn.net/V0023898/templa...;
height:0px;
display:block;
width:100%;
margin:-3px auto 0;
padding:0;
position:relative;
z-index:5;
}

div.ys_banner_wrap {
background:url(http://s2.yolacdn.net/V0023898/templa...) no-repeat top center transparent;
_behavior: url(http://s1.yolacdn.net/V0023898/templa...;
width:956px;
height:90px;
margin:-350px auto 0;
padding:0;
position:relative;
z-index:10;
}

#sys_banner {
background-image: url(resources/Photoxpress_2060915_1.jpg.cropped945x338o0%2C-228s610x366.jpg);
_behavior: url(http://s1.yolacdn.net/V0023898/templa...;
height:80px;
width:945px;
margin:0 auto;
padding:0;
top:4px;
left:6px;
position:absolute;
}