Nested submenus are overlapping how do i fix?

Question

http://bootply.com/68820 Nested submenus are overlapping how do i fix? Thank you.

html

<ul class="nav nav-pills">
    <li class="active"><a href="#">Regular link</a></li>
    <li class="dropdown">
        <a href="#" data-toggle="dropdown" class="dropdown-toggle">Dropdown <b class="caret"></b></a>
        <ul class="dropdown-menu" id="menu1">
            <li>
                <a href="#">2-level Menu <i class="icon-arrow-right"></i></a>
                <ul class="dropdown-menu sub-menu">
                    <li><a href="#">Action</a></li>
                    <ul class="dropdown-menu sub-menu">
                        <li><a href="#">a</a></li>
                        <li><a href="#">b</a></li>

                        </ul>
                    <li><a href="#">Another action</a></li>
                    <ul class="dropdown-menu sub-menu">
                        <li><a href="#">t</a></li>
                        <li><a href="#">t</a></li>

                    </ul>
                    <li><a href="#">Something else here</a></li>
                    <li class="divider"></li>
                    <li class="nav-header">Nav header</li>
                    <li><a href="#">Separated link</a></li>
                    <li><a href="#">One more separated link</a></li>
                </ul>
            </li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="divider"></li>
            <li><a href="#">Separated link</a></li>
        </ul>
    </li>

</ul>

css

.dropdown-menu .sub-menu {
    left: 100%;
    position: absolute;
    top: 0;
    visibility: hidden;
    margin-top: -1px;
}

.dropdown-menu li:hover .sub-menu {
    visibility: visible;
    display: block;
}



.navbar .sub-menu:before {
    border-bottom: 7px solid transparent;
    border-left: none;
    border-right: 7px solid rgba(0, 0, 0, 0.2);
    border-top: 7px solid transparent;
    left: -7px;
    top: 10px;
}
.navbar .sub-menu:after {
    border-top: 6px solid transparent;
    border-left: none;
    border-right: 6px solid #fff;
    border-bottom: 6px solid transparent;
    left: 10px;
    top: 11px;
    left: -6px;
}

.dropdown-menu li:hover > .dropdown-menu {
    visibility: visible;
    display: block;
}

example: action should have 'a' and 'b' but they are showing submenu of next menu. Its just puzzling me. Someone help me . Thank you.

Answer 1

use this html link is http://bootply.com/68830

    <ul class="nav nav-pills">
    <li class="active"><a href="#">Regular link</a></li>
    <li class="dropdown">
        <a href="#" data-toggle="dropdown" class="dropdown-toggle">Dropdown <b class="caret"></b></a>
        <ul class="dropdown-menu" id="menu1">
            <li>
                <a href="#">2-level Menu <i class="icon-arrow-right"></i></a>
                <ul class="dropdown-menu sub-menu">
                    <li><a href="#">Action</a>
                    <ul class="dropdown-menu sub-menu">
                        <li><a href="#">a</a></li>
                        <li><a href="#">b</a></li>

                        </ul>
                    </li><li><a href="#">Another action</a>
                    <ul class="dropdown-menu sub-menu">
                        <li><a href="#">t</a></li>
                        <li><a href="#">t</a></li>

                    </ul>
                  </li>
                    <li><a href="#">Something else here</a></li>
                    <li class="divider"></li>
                    <li class="nav-header">Nav header</li>
                    <li><a href="#">Separated link</a></li>
                    <li><a href="#">One more separated link</a></li>
                </ul>
            </li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="divider"></li>
            <li><a href="#">Separated link</a></li>
        </ul>
    </li>

</ul>

and this css

    .dropdown-menu .sub-menu {
    left: 100%;
    position: absolute;
    top: 0;
    visibility: hidden;
    margin-top: -1px;
}

.dropdown-menu > li:hover >  .sub-menu {
    visibility: visible;
    display: block;
}




.navbar .sub-menu:before {
    border-bottom: 7px solid transparent;
    border-left: none;
    border-right: 7px solid rgba(0, 0, 0, 0.2);
    border-top: 7px solid transparent;
    left: -7px;
    top: 10px;
}
.navbar .sub-menu:after {
    border-top: 6px solid transparent;
    border-left: none;
    border-right: 6px solid #fff;
    border-bottom: 6px solid transparent;
    left: 10px;
    top: 11px;
    left: -6px;
}