Different conversion rates between two offers — people stall at checkout

Compared two offers on my store. With a Discount Value offer — 724 sessions, 1.52% conversion rate. With a Free Shipping offer — 467 sessions, only 0.21% conversion rate. In both cases people reach checkout, but with the new offer almost no one completes the purchase. I haven't changed checkout itself. Should I go back to the discount offer, or could something else be going on?

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Different conversion rates between two offers — people stall at checkout