Flex Control nav not displaying inline in IE 9

not sure what is going on here, looking at the CSS everything is right

.flex-control-nav {
  position:absolute;
  display:inline-block;
  right:4%;
  bottom:7.3%;
  text-align:center;
}

.flex-control-nav li {
  display:inline-block;
  margin:0 0 0 15px;
}

.flex-control-nav li:first-child {
  margin:0;
}

.flex-control-nav li a {
  display:block;
  width:24px;
  height:24px;
  box-shadow:0 0 3px #999;
  cursor:pointer;
  background:#e9e9e9;
  color:#333;
  font-weight:bold;
  line-height:24px;
}

.flex-control-nav li a.active,
.flex-control-nav li a:hover {
  background:#fff;
}

but in IE 9 the controls are shown in a straight vertical line.