When editing a related list by clicking the EDIT button, the slushbucket displays sys_id's on the left-side. And the sys_id's that are displaying are not from the expect source table. Instead the sys_id's are from the relationship table.
For example, say we navigate to an ast_contract record and click the EDIT button of the "Assets Covered" (alm_hardware) related list. The sys_id's on the left side are unexpectedly from the:
table (the relationship table). However, the sys_id's should be from the alm_hardware table
Release or Environment
The cause could be a missing record in the sys_m2m table.
To check if there is a missing record in the sys_m2m table. Using the example tables above, Search the sys_m2m table for an entry where:
From Table = ast_contract
To Table = alm_hardware