remove parent divs for ol's. Here works just fine
Please see the refer how they do in official github of ui-sortable
<div>
<ol ui-sortable="srcSortableOptions" ng-model="srcData" class="sortSrc" style="display:inline;">
<li ng-repeat="item in srcData">{{item}}</li>
</ol>
<ol ui-sortable="tgtSortableOptions" ng-model="tgtData" class="sortTgt" style="display:inline;">
<li ng-repeat="item in tgtData">{{item}}</li>
</ol>
</div>