Problem in list manipulation

[CyKlop]

Error in list processing??

Class Diagram:

Bindable (my class)         list (built in)
        \                                  /
         +------------+----------+
                           |
                           V
                    BindableList

class Bindable:
    def __init__(self):
        super().__init__()
        self._binds = {}

    def bind(self, event, callback):
        if event not in self._binds.keys:
            self._binds[event] = []
        self._binds[event].append(callback)

    def event_generate(self, event_id, *params):
        for callback in self._binds[event_id]:
            callback(event_id, self, *params)

class BindableList(Bindable, list):
    def __init__(self):
        super().__init__()

    def append(self, __object) -> None:
        super().append(__object)
        self.event_generate(BindableList.ITEM_APPENDED, __object)

    def insert(self, index, __object) -> None:
        super().insert(index, __object)
       self.event_generate(BindableList.ITEM_INSERTED, index, __object)

    def remove(self, __object) -> None:
        super().remove(__object)
        self.event_generate(BindableList.ITEM_REMOVED, __object)

The purpose of BindableList is to keep a tkinter.ttk.Treeview synchronized with the various lists, even if the list is modified directly by someone else (i.e. a variation on the observer design pattern).

Here's the problem:

if I have a straight list:

my_list = list()
my_list.append(object1)
my_list.append(object2)
my_list.append(object3)

my_list.remove(object2)

all works fine. The resulting list only has object1 and object3 in it. HOWEVER, if I do:

my_list = BindableList()
my_list.append(object1)
my_list.append(object2)
my_list.append(object3)

my_list.remove(object2)

then my_list always removed the first item in the list - i.e. the result of the above code is that my_list contains object2 and object3

Version of python is 3.9.5 running on MS-Windows (the PyCharm IDE, if that matters)

Anyone see anything obvious that I'm messing up?