ios - tableview doesn't work properly in iPhone 6 simulator -

i have tableview gets data , shows them list. when run code on iphone 5 simulator, works fine. when test on iphone 6 simulator, 2 first cells have no functionality. form third cell, works fine too. i'm new on swift programming , have no idea why happens. here screenshot of app:

when plus or minus sign or add order, they're not working. after two, third item, works correctly.

here's code:

class drinkdetailcell : uitableviewcell {  @iboutlet var title: uilabel!   @iboutlet var price: uilabel!  @iboutlet var image2: uiimageview!  @iboutlet var addbasket: uibutton!  var order = orderdrink()  @ibaction func addtobasket(sender: anyobject) {      order.count = string( amounth )     orderdrinktable().add(order)     nsnotificationcenter.defaultcenter().postnotificationname( "reloadprice", object: nil)      hud.flash(.success, delay: 1.0) }  var amounth = 1  @ibaction func mines(sender: anyobject) {      if( amounth > 1 )     {         amounth -= 1         quantity.text = string( amounth )     } }  @ibaction func plus(sender: anyobject) {      amounth += 1     quantity.text = string( amounth ) }  @iboutlet var quantity: uilabel!  @iboutlet var quantity1: uilabel!   override init(style:  uitableviewcellstyle, reuseidentifier: string? ) {     super.init(style: style , reuseidentifier: reuseidentifier)  } required init?(coder adecoder: nscoder) {     super.init(coder: adecoder)     self.backgroundcolor = uicolor.clearcolor() }  }