This can happen due to unexpected issue during the pdm_publish process that result in the published fields not added to the ddict.sch file.
To address this issue, check the following:
i. Fields are correctly added to the physical table in database
ii. Field show up when running bop_sinfo command for the object in question
iii. Fields are visible in the wspcol table
iv. Fields are added to the wsp.mods file
If the the above 4 conditions are met, it is save to simply copy the fields from wsp.mod and add them to the ddict.sch file for the table in question and then recycle the services. Once the missing fields are added to the ddict.sch file they will be visible on WSP form or to pdm_extract output.