list of checkboxes ng-click returning always the first element when any other is clicked, ng-disabled not working

I gave a grid of checkboxes, whenever I try to click any it passes always the same one in the ng-click

HTML

<tr ng-repeat="partecipant in current_event.partecipants">
                        <td class="user_cell"><font class="user_name">{{(partecipant}}</font><span class="arrow"></td>
                        <td class="checkbox_cell" ng-repeat="proposed_time in current_event.proposed">
                            <input type="checkbox" class="toggle" ng-checked="isChecked(partecipant, proposed_time)" ng-true-value="true"  ng-false-value="false" ng-click="addResponse(partecipant, proposed_time)" ng-disabled="userProfile.webid != partecipant" name="thing" id="thing"><label for="thing">
                        </td>
                    </tr>

ng-checked: works fine, the checkboxes are checked accordingly

ng-click: not working, it passes always the first value of proposed_time

ng-disabled: not working, the are all enabled, when they should be enabled only for one row when userProfile.webid == partecipant

Any help is appreciated. Thanks in advance.