using if is giveing me different results in the same cod

as show in pic, why is this happen to ( Iron – Fe )( Carbon – C)( Nitrogen – N)( Phosphors- P)
only the ( Sulfur – S) is working good whitout problem
my html cod is:

{% if object.Iron_Fe != '-' %}
            <tr type="hidden>
                <td style="text-align:left">Iron - Fe</td>
                <td>{{ object.Iron_Fe }}</td>
            </tr>
            {% endif %}


            {% if object.Carbon_C != '-' %}
            <tr type="hidden>
                <td style="text-align:left">Carbon - C</td>
                <td>{{ object.Carbon_C }}</td>
            </tr>
            {% endif %}

            {% if object.Nitrogen_N != '-' %}
                <tr type="hidden>
                    <td style="text-align:left">Nitrogen - N</td>
                    <td>{{ object.Nitrogen_N }}</td>
                </tr>
            {% endif %}
{% if object.Phosphorus_P != '-' %}
                <tr type="hidden>
                    <td style="text-align:left">Phosphorus - P</td>
                    <td>{{ object.Phosphorus_P }}</td>
                </tr>
            {% endif %}

            {% if object.Sulfur_S != '-' %}
                <tr type="hidden">
                    <td style="text-align:left">Sulfur - S</td>
                    <td>{{ object.Sulfur_S }}</td>
                </tr>
            {% endif %}

>Solution :

For all atoms except the sulpher, you forgot to close the attribute with type="hidden":

<tr type="hidden">  <!-- ← add " at the end of hidden -->
    …
</tr>