Can someone tell me why there's 3 massagebox appeared upon Bind(<'FocusIn'>)

Question

self.Lowest = tk.Label(self.Frame2,  font=(\'Arial\', 12), text=\'lower limit\', bg=\'#E8E8E8\', bd=7, anchor=W)
self.Lowest.grid(row=4, column=1)
self.Lowest_e = tk.Ent