Hi,

This issue can occur due to various reasons, including caching, incorrect module update procedures, or issues with your Odoo environment.

The issue you're experiencing is likely due to Odoo's caching mechanism, which is designed to improve performance by storing compiled Python code and other resources in memory. When you update your custom module, Odoo may not automatically detect the changes and apply them.

The following steps will help you to resolve your problem:

1)Clear caches.

2)Update the module properly

3)Reinstall the module if necessary.

Hope it helps