iOS segue ejecutado dos veces

I have a table view with different types of table view cells in it. In one of the cells, there are two buttons, which load a view controller when pressed. I am using the following function to handle the button press:

- (IBAction)leftButtonPressed:(id)sender
{
    // Getting the pressed button
    UIButton *button = (UIButton*)sender;
    // Getting the indexpath
    NSIndexPath *indPath = [NSIndexPath indexPathForRow:button.tag inSection:0];
    // Loading the proper data from my datasource
    NSArray *clickedEvent = [[[SOEventManager sharedEventManager] eventsArray] objectAtIndex:indPath.row];
    [[SOEventManager sharedEventManager] setSelectedEvent:clickedEvent[0]];
    // Everything working as it should up to this point
    // Performing seque...
    [self performSegueWithIdentifier:@"buttonSegue" sender:self];
}

My buttonSegue is supposed to push a new view controller. Somehow instead of pushing once, it appears to be pushing twice, so I get the following warning:

2013-11-27 01:48:30.894 Self-Ordering App[2081:70b] nested push animation can result in corrupted navigation bar 
2013-11-27 01:48:31.570 Self-Ordering App[2081:70b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

In my case it leads to a crash, since there is an event in which I want the app to immediately pop the view controller so it an go back to my table view. I use an alertview for this and handle the event with the following:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSString *buttonTitle = [alertView buttonTitleAtIndex:buttonIndex];
    // ...
    // Additional checking of button titles....
    else if ([buttonTitle isEqualToString:NSLocalizedString(@"Vissza", nil)])
    {
        [self.navigationController popViewControllerAnimated:YES];
    }
}

It might me interesting to note that I have an other segue from my "regular" table view cell, and in that case I use the prepareForSegue: method

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"detailSegue"])
    {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        SOEvent *selectedEvent = [[[SOEventManager sharedEventManager] eventsArray] objectAtIndex:indexPath.row];
        [[SOEventManager sharedEventManager] setSelectedEvent:selectedEvent];
    }
}

In this case the view controller gets pushed perfectly, and even popped immediately if that is required. I am testing this on iOS7 and Xcode 5. I haven't encountered a problem like this before, any help would be greatly appreciated.