Radio buttons in bootstrap material design become invisible while using ng-repeat

Question

I use bootstrap material design to add material effects in my project, when I use ng-repeat with it the radio button become invisible, when I remove radio radio-success class radio button become visible but without its effect.

<div class="col-md-12" ng-repeat="reason in questionData.reasons track by $index">
<div class="radio radio-success">
  <label>
    <input type="radio" ng-model="currentquestion.correct_reason" value="{{$index}}" name="reason">
    {{reason}}
  </label>
</div>

Answer 1

I return to bootstrap material and I found another way to make radio button from bootstrap elements.

<div class="radio radio-primary"> 
    <label> 
        <input type="radio" name="optionsRadios" id="optionsRadios1" value="option1" checked="">
        <span class="circle"></span>
        <span class="check"></span> 
        Option one is this 
    </label> 
</div>