Multiple checkbox-forms with ng-repeat - angularjs

Question

I'm new to angularjs / ionic and I try to create an ionic-app that posts IDs of prodcuts to a webserver. I have to display multiple <form> on one page with checkboxes (..and other types like select).
When I submit the first form everything works as expected. But when I try to submit a second form, the scope contains values from the first and from the second form. When i submit an empty form it also submits the values from the first form. Is there a way to "clean" the scope after every submit? How can I assure that the submit-button only submits values from its own form?
This is the <form> :
<form ng-submit="addCartFive()" name="type5_{{item.ID}}">
<div class="row">
<div class="col col-80"><strong>{{item['name']}}</strong> <br/>
{{item['description']}}
</div>
</div>
<div ng-repeat="variant in item.variants">
<ion-list ng-repeat="detail in variant.details">
<ion-checkbox name="sub-{{$index}}" ng-true-value="{{detail.ID}}" ng-model="formDataObjFive[$index][detail.ID]">
{{detail.name}} <span class="right">+ {{detail.price}}</span>
</ion-checkbox>
</ion-list>
</div>
<div class="row">
<button type="submit" ng-click="setValueFive(formDataObjFive)">order</button>
</div>
</form>
this is the relevant part of my controller:
$scope.setValueFive = function(a1) {
$scope.formDataObjFive = a1;
};
$scope.addCartFive = function () {
console.log($scope.formDataObjFive);
CartService.save($scope.formDataObjFive) // send the values to factory wich posts to server
};