ng-model not updating AngularJS - angularjs

Question

So i have this html. The issues is that is changing the model(filter) when i select one of those that i have create in a static way but the dynamic ones does not trigger the change of the value. Any ideas?
Thanks.
<div class="row">
<div class="col-xs-6">
<h3>Group 1</h3>
<hr>
<div class="checkbox">
<input type="radio" name="filterGroup" ng-model="filter" ng-value="5"><label>5</label>
</div>
<div class="checkbox">
<input type="radio" name="filterGroup" ng-model="filter" ng-value="4'"><label>4</label>
</div>
</div>
<div class="col-xs-6">
<h3>Group 2</h3>
<hr>
<div class="checkbox">
<input type="radio" name="filterGroup" ng-model="filter" ng-value="3"><label>3</label>
</div>
<div class="checkbox">
<input type="radio" name="filterGroup" ng-model="filter" ng-value="2'"><label>2</label>
</div>
<div class="checkbox">
<input type="radio" name="filterGroup" ng-model="filter" ng-value="1"><label>1</label>
</div>
</div>
</div>
<div class="row">
<div class="col-xs-6">
<h3>DinamicItems</h3>
<hr>
<div class="checkbox" ng-repeat="item in items">
<input type="radio" name="filterGroup" ng-model="filter" ng-value="'{{item.value}}'"><label>{{item.text}}</label>
</div>
</div>
</div>

Answer 1

What Charlie is saying is, your model of tag is a primitive one. Each instance of ng-repeat creates it's own scope. Therefore, your models, although named 'tag', are not in fact the same.
To remedy, you should make your model something like vm.tags (vm = view model.)
A few things to read up on, and learn more:
Controller As: https://johnpapa.net/angularjss-controller-as-and-the-vm-variable/
ng-repeat: https://docs.angularjs.org/api/ng/directive/ngRepeat
Understanding Scopes https://github.com/angular/angular.js/wiki/Understanding-Scopes (When I was getting started with Angular, I had to read through this a few times, and still do on occasion)