The first step is to identify if you recently installed any plugins or themes as there may be a conflict or bug somewhere that needs sorted out. If this is the case try to disable/deactivate the plugin or theme you recently installed.
Go to section->product-template.liquid ->find {% if section.settings.show_quantity_selector %} and comment code that in between condition (only product-form__item–quantity this div ). and paste bellow: <div class=”qtydiv”> <label…
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