save() creates new entry instead of updating the passed on as instance

this is my code and weirdly it creates new entry instead of updating the passed one in instance argument, don't know if that because of m2m relationship in Entry model or my code is broken!

what could be the cause?

### my edit view

@login_required

def edit_entry_view(request, entry_id):

        

    try:

        entry = Entry.objects.get(pk=entry_id, is_visible=True)

    except ObjectDoesNotExist:

        return render(request, 'entry/entry.html', {'no_enties': True})

    if request.method == 'POST':

        entry.owner = request.user

        entry.id = entry_id

        form = EntryForm(data=request.POST, instance=entry)

        if form.is_valid():

          form.save()

          return redirect('entry')

    else:

        form = EntryForm(instance=entry)

    return render(request, 'entry/edit_entry.html', {'form': form})

###my form

class EntryForm(ModelForm):

    

    class Meta:

        model = Entry

        exclude = ('owner')

 

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