Exposed filter - strange bug

I have a view with exposed filter (ajax-enabled). It works fine on separate page, but in embedded form it doesn't show filter form:

<div class="view view-price view-id-price view-display-id-default view-dom-id-1 views-processed">
  <div class="view-filters">
    <div><div class="views-exposed-form">
      <div class="views-exposed-widgets clear-block">
        <div class="views-exposed-widget views-widget-filter-title">
           Search
           <div class="views-widget">
             <div class="form-item">
             </div>
        </div>
      </div>
      <div class="views-exposed-widget views-submit-button">
      </div>
      </div>
   </div>
  </div>
    </div>
  
    <div class="view-content">
       ... content ...
    </div>
  
    <div class="item-list">
       ... pager ...
    </div>  
</div>

But then I click on view pager and select another page it shows form. I can select first page again and it still shows filter form:

<div class="view view view-price view-id-price view-display-id-default view-dom-id-1 view-price view-id-price view-display-id-default view-dom-id-1 views-processed">
      <div class="view-filters">
      <form action="/price" accept-charset="UTF-8" method="get" id="views-exposed-form-price-default" class="views-processed">
<div><div class="views-exposed-form">
  <div class="views-exposed-widgets clear-block">
          <div class="views-exposed-widget views-widget-filter-title">
                  <label for="edit-title">
            Search          </label>
                        <div class="views-widget">
          <div class="form-item" id="edit-title-wrapper">
 <input type="text" maxlength="128" name="title" id="edit-title" size="30" value="" class="form-text">
</div>
        </div>
      </div>
                    <div class="views-exposed-widget views-submit-button">
      <input type="submit" id="edit-submit-price" value="Apply" class="form-submit">
    </div>
      </div>
</div>

</div><input type="hidden" name="view_name" value="price"><input type="hidden" name="view_display_id" value="default"><input type="hidden" name="view_args" value=""><input type="hidden" name="view_path" value="node/1817"><input type="hidden" name="view_base_path" value="price"><input type="hidden" name="view_dom_id" value="1"><input type="hidden" name="pager_element" value="0"></form>
    </div>
  
  
    <div class="view-content">
       ... content ...
    </div>
  
    <div class="item-list">
       ... pager ...
    </div>  
</div>

In other words it doesn't show filter form initially. But after switching to a second or another page it shows filter form.

How to fix it? Help please.