Hi,
Thank you for that.
From what I can see, the issue comes from that piece of CSS code in that file:
/*
* cursor filters
*/
.hikashop_filter_cursor_range { display:inline-block; }
.ui-widget { font-family: Verdana,Arial,sans-serif; font-size: 1.1em; }
.ui-widget .ui-widget { font-size: 1em; }
.ui-widget input, .ui-widget select, .ui-widget textarea, .ui-widget button { font-family: Verdana,Arial,sans-serif; font-size: 1em; }
.ui-widget-content { border: 1px solid #aaaaaa; background: #ffffff url(../images/icons/ui-bg_flat_75_ffffff_40x100.png) 50% 50% repeat-x; color: #222222; }
.ui-widget-content a { color: #222222; }
.ui-widget-header { border: 1px solid #aaaaaa; background: #cccccc url(../images/icons/ui-bg_highlight-soft_75_cccccc_1x100.png) 50% 50% repeat-x; color: #222222; font-weight: bold; }
.ui-widget-header a { color: #222222; }
.ui-state-default, .ui-widget-content .ui-state-default, .ui-widget-header .ui-state-default { border: 1px solid #d3d3d3; background: #e6e6e6 url(../images/icons/ui-bg_glass_75_e6e6e6_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #555555; }
.ui-state-default a, .ui-state-default a:link, .ui-state-default a:visited { color: #555555; text-decoration: none; }
.ui-state-hover, .ui-widget-content .ui-state-hover, .ui-widget-header .ui-state-hover, .ui-state-focus, .ui-widget-content .ui-state-focus, .ui-widget-header .ui-state-focus { border: 1px solid #999999; background: #dadada url(../images/icons/ui-bg_glass_75_dadada_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #212121; }
.ui-state-hover a, .ui-state-hover a:hover { color: #212121; text-decoration: none; }
.ui-state-active, .ui-widget-content .ui-state-active, .ui-widget-header .ui-state-active { border: 1px solid #aaaaaa; background: #ffffff url(../images/icons/ui-bg_glass_65_ffffff_1x400.png) 50% 50% repeat-x; font-weight: normal; color: #212121; }
.ui-state-active a, .ui-state-active a:link, .ui-state-active a:visited { color: #212121; text-decoration: none; }
.ui-widget :active { outline: none; }
.ui-corner-all, .ui-corner-bottom, .ui-corner-left, .ui-corner-bl { -moz-border-radius: 4px; -webkit-border-radius: 4px; -khtml-border-radius: 4px; border-radius: 4px; }
.ui-corner-all, .ui-corner-bottom, .ui-corner-right, .ui-corner-br { -moz-border-radius: 4px; -webkit-border-radius: 4px; -khtml-border-radius: 4px; border-radius: 4px; }
.ui-widget-overlay { background: #aaaaaa url(../images/icons/ui-bg_flat_0_aaaaaa_40x100.png) 50% 50% repeat-x; opacity: .30;filter:Alpha(Opacity=30); }
.ui-widget-shadow { margin: -8px 0 0 -8px; padding: 8px; background: #aaaaaa url(../images/icons/ui-bg_flat_0_aaaaaa_40x100.png) 50% 50% repeat-x; opacity: .30;filter:Alpha(Opacity=30); -moz-border-radius: 8px; -khtml-border-radius: 8px; -webkit-border-radius: 8px; border-radius: 8px; }
.ui-slider { position: relative; text-align: left; }
.ui-slider .ui-slider-handle { position: absolute; z-index: 2; width: 1.2em; height: 1.2em; cursor: default; }
.ui-slider .ui-slider-range { position: absolute; z-index: 1; font-size: .7em; display: block; border: 0; background-position: 0 0; }
.ui-slider-horizontal { height: .8em; width:250px; }
.ui-slider-horizontal .ui-slider-handle { top: -.3em; margin-left: -.6em; }
.ui-slider-horizontal .ui-slider-range { top: 0; height: 100%; }
.ui-slider-horizontal .ui-slider-range-min { left: 0; }
.ui-slider-horizontal .ui-slider-range-max { right: 0; }
.ui-slider-vertical { width: .8em; height: 100px; }
.ui-slider-vertical .ui-slider-handle { left: -.3em; margin-left: 0; margin-bottom: -.6em; }
.ui-slider-vertical .ui-slider-range { left: 0; width: 100%; }
.ui-slider-vertical .ui-slider-range-min { bottom: 0; }
.ui-slider-vertical .ui-slider-range-max { top: 0; }
That CSS was added on our end for the cursor filter system we were using before.
We actually don't use it anymore as we switched 2 years ago to a new system which doesn't require ui classes and jquery.
We kept that CSS as as backward compatibility but I guess it's not that useful anymore.
So I propose to just remove it from the file.
We'll do so with the next release of HikaShop.
In the mean time, you can directly remove that block of code from the file on your website and it will solve the problem.