Why does my code add data-button-status='pre-order' even when variant_pre_order is false?

[DariusWS]

    {% unless current_variant.available %}
         disabled="disabled" data-button-status="sold-out"
    {% elsif variant_pre_order %} data-button-status="pre-order"{% else %}
        {% if enable_select_variant_button == true or enable_select_options_button %} data-button-status="select" data-button-default-status="select"
            {% if button_select_disable %} data-button-select-disable{% endif %}
        {% endif %}
    {% endunless %}>

HI,

not sure how it is possible. current_variant.available == true and variant_pre_order == false but some how adds data-button-status="pre-order"

tried elsif statement with 

variant_pre_order == true

 still variant_pre_order = false but but somehow accepts as TRUE. How it is possible?

started happening after a weekend