Почему в селектах в первом случае отображается SECURITY_WITHOUT, а во втором -display? Ведь все идентично, по сути ...

Вообще в обеих случаях должна отображаться переведенная фраза с django.po. Но как этого добиться, не пойму?

Скриптов, которые могли бы влиять на разметку, вроде нет.

models.py

SECURITY_WITHOUT = 'Without display'         #отображается `SECURITY_WITHOUT`
CONFIRMATION_WITHOUT = 'display'              #отображается `display`

SECURITY_CHOICES = (
    (SECURITY_WITHOUT, _('Without display'))  #Должна отображаться переведённая фраза `Without display` (с `django.po`)
)
CONFIRMATION_CHOICES = (
    (CONFIRMATION_WITHOUT, _('Display')),     #Должна отображаться переведённая фраза `Display` (с `django.po`)
)

income_proof = models.CharField(_('proof'), max_length=255, choices=CONFIRMATION_CHOICES, default=CONFIRMATION_WITHOUT)
security = models.CharField(_('security'), max_length=255, choices=SECURITY_CHOICES, default=SECURITY_WITHOUT)

forms.py

security = forms.ModelChoiceField(queryset=CreditPayment.objects.values_list('security', flat=True).distinct(), widget=forms.Select(attrs={'class': "selectpicker form-control", 'title':_("Security")}))
income_proof = forms.ModelChoiceField(queryset=CreditPayment.objects.values_list('income_proof', flat=True).distinct(), widget=forms.Select(attrs={'class': 'selectpicker form-control', 'title':_("Income proof")}))

template

{{ big_form.security }}
{{ big_form.income_proof }}

html

<div class="form-group">
  <div class="dropdown bootstrap-select form-control show">
        <select class="selectpicker form-control" id="id_big-security" name="big-security" tabindex="-98">
            <option value="" selected="selected">---------</option>
            <option value="SECURITY_WITHOUT">SECURITY_WITHOUT</option>
        </select>
        <button type="button" class="btn dropdown-toggle bs-placeholder btn-light" data-toggle="dropdown" role="button" data-id="id_big-security" title="---------" aria-expanded="true"><div class="filter-option"><div class="filter-option-inner"><div class="filter-option-inner-inner">---------</div></div> </div></button>
        <div class="dropdown-menu show" role="combobox" style="max-height: 394px; overflow: hidden; min-height: 0px; position: absolute; transform: translate3d(0px, 61px, 0px); top: 0px; left: 0px; will-change: transform;" x-placement="bottom-start"><div class="inner show" role="listbox" aria-expanded="true" tabindex="-1" style="max-height: 376px; overflow-y: auto; min-height: 0px;"><ul class="dropdown-menu inner show"><li class="selected active"><a role="option" class="dropdown-item selected active" aria-disabled="false" tabindex="0" aria-selected="true"><span class=" bs-ok-default check-mark"></span><span class="text">---------</span></a></li><li><a role="option" class="dropdown-item" aria-disabled="false" tabindex="0" aria-selected="false"><span class=" bs-ok-default check-mark"></span><span class="text">SECURITY_WITHOUT</span></a></li></ul></div></div></div>
</div>

<div class="form-group">
    <div class="dropdown bootstrap-select form-control">
        <select class="selectpicker form-control" id="id_big-income_proof" name="big-income_proof" tabindex="-98">
            <option class="bs-title-option" value=""></option>
            <option value="display">display</option>
        </select>
        <button type="button" class="btn dropdown-toggle bs-placeholder btn-light" data-toggle="dropdown" role="button" data-id="id_big-income_proof"><div class="filter-option"><div class="filter-option-inner"><div class="filter-option-inner-inner"></div></div> </div></button>
        <div class="dropdown-menu " role="combobox"><div class="inner show" role="listbox" aria-expanded="false" tabindex="-1"><ul class="dropdown-menu inner show"></ul></div></div></div>
</div>