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

[Zeengr]

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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