My org is seeing this error when we convert leads - We do not have a validation rule on the account that says this. Where does this validation rule live if is not on the account? Does Rollup helper have validation rules? I am not familiar with this tool.
23:15:23.160 (2160425179)|DML_END| 23:15:23.162 (2162368464)|DML_END| 23:15:23.162 (2162425434)|EXCEPTION_THROWN||System.DmlException: ConvertLead failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, Validation error on Account: Rollup Helper cannot update parent record 0051J000006RHQXQA4: NUMBER_OUTSIDE_VALID_RANGE: # Accounts Picked Up This Week: value outside of valid range on numeric field: 100: