Problemas con UNION ALL

[echo_]

Me sale columnas vacias, yo lo intento hacer asi:

Código MySQL:

SELECT tl.idperson, tl.firstName, tl.lastName, tl.telephone, tl.degreeOfInterest, l.appointmentDate, e.firstName, i.marketability
  FROM `todos_los_leads` AS tl
  INNER JOIN leads AS l ON tl.idperson = l.idPerson
  INNER JOIN empleados AS e ON tl.idEmployee = e.idEmployee
  INNER JOIN infonavit AS i ON tl.idInfonavit = i.idInfonavit
UNION 
  SELECT s.monthlyIncome
  FROM `todos_los_leads` AS tl
  INNER JOIN shf AS s ON tl.idSHF = s.idSHF
 

En todos los leads guardo:

Código SQL:

idperson,firstName,lastName,middleName,email,address1,address2,colony,city,idState,zipcode,telephone,cellphone,otherphone,active,idEmployee,idEmployeeCSR,company,LENGTH,POSITION,gender,ssn,maritalStatus,kids,birthDate,createdDate,idFlag,spouse,needFinancing,idMarketingSource,idAccountGroup,idLeadClass,idDistributionChannel,idCustomerClass,idIncomeClass,idProfessionClass,idSalesZone,idTitle,comments,idCommunicationClass,infonavitQualify,visitCount,sessionId,idPersonContact,idEmployeeCSRLead,idEmployeeCSRPostSale,curp,idInfonavit,idSHF,appliesFOVISSSTE,leadType,companyVisited,idCampaing,degreeOfInterest,reallocations,lastAssignment,idBranch,idBranchLead,hasExtras,idEmployeeCSRTitration,idBranchTitration,degreeOfInterestChangedDate,idBranchPostSale,idPersonSAP,idSellersGroup,idNotQualifyReason,idcreditBureau,preQualification,infoLastUpdated,idEmployeeCSRTelemarketing,creditNumber,isSubsidy,folio
 

En infonavit:

Código SQL:

idInfonavit,qualifies,credit,ssv,marketability,expectedDate
 

Y en SHF:

Código SQL:

idSHF,TYPE,monthlyIncome,saveDate1,saveDate2,saveDate3,saveDate4,saveDate5,saveDate6