Why is my e-commerce add-to-cart rate dropping even though I'm spending more on ads?

Higher ad spend can bring more visitors, but if product pages have unanswered objections like shipping costs, return policies, or sizing doubts, the add-to-cart rate stays flat or drops. Boring specification-only copy and hidden mobile CTAs also make shoppers leave. The fix is to lead with benefits, add trust and guarantee messages near the button, and keep key information above the fold. Seatext's Ecommerce Product Copy Agent can test product page copy automatically to find what actually increases add-to-cart rate.