Can you elaborate on what type of custom fields have you created? Are they from some add-on? Also, you can check below links from EazyBI documentation on how to add custom fields in EazyBI:
https://docs.eazybi.com/eazybijira/data-import/custom-fields
https://docs.eazybi.com/eazybijira/data-import/custom-fields/advanced-settings-for-custom-fields
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