I agree that it's strange. Unfortunately, you've not given me much with which to diagnose what's wrong.
Is the install on zc157 (no alphabetic suffix) or zc157a or zc157b? If not zc157b (and especially for zc157, no suffix), you need to be sure to apply all the bugfixes (
https://www.zen-cart.com/showthread....v1-5-7-series).
What shipping, payment and order-total modules are in use? They've each got a 'play' in the order-generation process.
What template is in use? Many "pretty" templates don't exactly conform to the base Zen Cart model. What version of jQuery is being used?
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