Can you pls delete these lines from plugins/timetable/style/superfish.css file from line number 89 to 111. That should resolve this issue –
.sf-sub-indicator {
position: absolute;
display: block;
right: .75em;
top: 1.05em; /* IE6 only */
width: 10px;
height: 10px;
text-indent: -999em;
overflow: hidden;
background: url('../images/arrows-ffffff.png') no-repeat -10px -100px; /* 8-bit indexed alpha png. IE6 gets solid image only */
}
a > .sf-sub-indicator { /* give all except IE6 the correct values */
top: .8em;
background-position: 0 -100px; /* use translucent arrow for modern browsers*/
}
/* apply hovers to modern browsers */
a:focus > .sf-sub-indicator,
a:hover > .sf-sub-indicator,
a:active > .sf-sub-indicator,
li:hover > a > .sf-sub-indicator,
li.sfHover > a > .sf-sub-indicator {
background-position: -10px -100px; /* arrow hovers for modern browsers*/
}