Zen Cart Checkout Bug Fix

I'm currently facing a bug with my Zen Cart platform. Specifically, during the checkout process, the shipping options are not displaying. This issue is preventing customers from completing their purchases with shipping charges, only option is PICKUP.

Ideal Skills and Experience:
- Proficiency in Zen Cart
- Experience with debugging and troubleshooting checkout processes
- Familiarity with e-commerce platforms
- Ability to provide quick and efficient solutions to technical issues