livereload reload my web page without changes files - html

Question

i don´t know why my web page reload when i add new register, the diference between next code is the form tag. Whith the first code the page is reloaded and the second code without form tag page isn´t reloaded, I can´t understand why. Could someone help me?
<div class="container" ng-controller="mybranchofficeCtrl">
<h2>Mis Salas</h2>
<!--newRoom input-->
<form role="form">
<div class="row">
<div class="input-group">
<input type="text" class="form-control" ng-model="room.rooms.name" placeholder="Crea tu Sala">
<span class="input-group-btn">
<input type="submit" class="btn btn-primary" ng-click="newRoom()" value="Añadir">
</span>
</div>
</div>
</form>
<p></p>
<p class="input-group" ng-repeat="room in rooms.data">
<input class="form-control" type="text" ng-model="room.name">
<span class="input-group-btn">
<button class="btn btn-danger" ng-click="disableRoom($index)" arial-label="delete">X</button>
</span>
</p>
</div>
but with this no, what is the diference?
<div class="container" ng-controller="mybranchofficeCtrl">
<h2>Mis Salas</h2>
<!--newRoom input-->
<div class="row">
<div class="input-group">
<input type="text" class="form-control" ng-model="room.rooms.name" placeholder="Crea tu Sala">
<span class="input-group-btn">
<input type="submit" class="btn btn-primary" ng-click="newRoom()" value="Añadir">
</span>
</div>
</div>
<p></p>
<p class="input-group" ng-repeat="room in rooms.data">
<input class="form-control" type="text" ng-model="room.name">
<span class="input-group-btn">
<button class="btn btn-danger" ng-click="disableRoom($index)" arial-label="delete">X</button>
</span>
</p>
</div>
these are controllers i´m using whith html code.
$scope.newRoom = function() {
$scope.room.rooms.branchoffice_id = $scope.branchId;
butlerService.createRoom($scope.room).then(function(newroom) {
$scope.rooms.rooms.push(newroom);
});
}
$scope.disableRoom = function(index) {
var delroom = {};
delroom = {rooms:{id:$scope.rooms.data[index].id}}
butlerService.deleteRoom(delroom).then(function() {
$scope.rooms.data.splice(index,1);
});
}
Thanks in advance.