On an Odoo server, fully updated, in language es_ES, the Leads view renders this inside the address_format part:

<div class="address_format">
  <span title="" data-original-title="" class="oe_form_field oe_form_field_char" style="width: 40%%">
    <input maxlength="24" placeholder="ZIP" type="text">
  </span>
  <span title="" data-original-title="" class="oe_form_field oe_form_field_char" style="width: 57%%">
    <input placeholder="City" type="text">
  </span>
  <br>
  <span title="" data-original-title="" class="oe_form_field oe_form_field_many2one oe_form_field_with_button oe_no_button">
    <div>
      <input autocomplete="off" class="ui-autocomplete-input" placeholder="State" type="text">
      <span class="ui-helper-hidden-accessible" aria-live="polite" role="status"></span>
      <span class="oe_m2o_drop_down_button">
        <img draggable="false" src="https://example.com/web/static/src/img/down-arrow.png">
      </span>
    </div>
  </span>
</div>

That's wrong because:

1. It's in English (see placeholders?) and should be in Spanish.
2. Percentage width values have two symbols like %%.
3. It's not what the form view says!
4. Any changes I make in the view inside the <div class="addres_format"> tag don't render at all.

But another empty server, with no data but with the same modules installed, renders this:

<div class="address_format">
  <span title="" data-original-title="" class="oe_form_field oe_form_field_char  oe_form_important" style="width: 40%">
    <input placeholder="Ciudad" type="text">
  </span>
  <span title="" data-original-title="" class="oe_form_field oe_form_field_many2one oe_form_field_with_button" style="width: 24%">
    <div>
      <input autocomplete="off" class="ui-autocomplete-input" placeholder="Estado" type="text">
      <span class="ui-helper-hidden-accessible" aria-live="polite" role="status"></span>
      <span class="oe_m2o_drop_down_button">
        <img draggable="false" src="http://localhost:8069/web/static/src/img/down-arrow.png">
      </span>
    </div>
  </span>
  <span title="" data-original-title="" class="oe_form_field oe_form_field_char" style="width: 34%">
    <input maxlength="24" placeholder="C.P." type="text">
  </span>
</div>

This time it's fine, all errors are fixed, but I cannot make the server 1 behave as the server 2 unles I remove the class from the div. What is happening there?