Issue in applying margin using angular “data-ng-style”

There is <li> element in HTML that is calling a JS method “SiteAssetStyleForShiftedAsset” like this

<li class="holder-white title-holder" data-ng-style="{{SiteAssetStyleForShiftedAsset()}}" data-ng-click="getSiteAssetDetailByAssetId(asset.id,asset.assetId,asset.jobPlantId, asset.siteAssetId, asset.uniqueKey, asset.plantId,asset.siteAssetGuidId);">

Inside JS we defined that method like this:

$scope.SiteAssetStyleForShiftedAsset = SiteAssetStyleForShiftedAsset;
function SiteAssetStyleForShiftedAsset() {

    var isPPMJob = localStorage.getItem("IsPPMJob").toUpperCase();

    var shiftingAsset = $scope.addClassForShiftingAsset;

    if (isPPMJob == "FALSE") {
        return { "margin-right": "50px" };
    }
    else if (isPPMJob == "TRUE") {
        if (shiftingAsset == true || shiftingAsset == "true") 
        {
            return { "margin-right": "50px" };
        }
        else {
            return { "padding-right:": "15px" };
        }
    }
}

In outer If condition that states “if (isPPMJob == “FALSE”)” margin is applying perfectly fine
But when condition become “TRUE” in “else if (isPPMJob == “TRUE”)” it isn’t applying margin.
However alerts in all statements are working. Only problem with applying margin.
I have also inspected the element and it was showing data-ng-style=”{“margin-right”:”50px”}” but on the view nothing was changed.