Custom tkinter Option Menu starts function alone when window opens

I'm trying to make a language changer with the CTkOptionMenu but every time I open the "settings window" (the window where the options menu is located) it starts the function without any user clicking, and unlike the buttons putting "labmda: or lambda x:" didn't work

self.Optionmenu = customtkinter.CTkOptionMenu(self.window,
                                                        values=["Português-pt", "English"],
                                                        command=self.change_language,
                                                        hover=True)
            self.Optionmenu.place(relx=0.95, rely=0.16, anchor="e")
def change_language(self, choice):
        choice = self.Optionmenu.get()
        match choice:
            case "Português-pt":
                Config.set("DEFAULTS", "Language", "Pt-pt")
                with open(Config_File, "w") as f:
                    Config.write(f)
                    f.close
            #case "Português-br":
            #    SelectedLanguage = L.PT_br
            #    root_tk.destroy()
            #    root_tk.__init__()
            case "English":
                Config.set("DEFAULTS", "Language", "English")
                with open(Config_File, "w") as f:
                    Config.write(f)
                    f.close