Why?

SELECT wo.WORKORDERID AS "Request ID", au.FIRST_NAME AS "Assessment technician", woa.EXECUTEDTIME AS "Assessment start time", wti.ENDTIME AS "Assessment end time", wti.TIMESPENT AS "Time Spent", au1.FIRST_NAME AS "Assessment technician changed to", ao.FIRST_NAME AS "Technician changed by", aau.FIRST_NAME AS "Requester", cd.CATEGORYNAME AS "Category", scd.NAME AS "Subcategory", wo.TITLE AS "Subject", icd.NAME AS "Item", sdo.NAME AS "Site", wo.CREATEDTIME AS "Created Time", qd.QUEUENAME AS "Group", wotodesc.FULLDESCRIPTION AS "Description", std.STATUSNAME AS "Request Status" FROM WorkOrder wo LEFT JOIN WO_Assessment woa ON wo.WORKORDERID=woa.WORKORDERID INNER JOIN WO_Tech_Info wti ON woa.ASSESSMENTID=wti.ASSESSMENTID LEFT JOIN AaaUser au ON wti.TECHNICIANID=au.USER_ID LEFT JOIN AaaUser au1 ON wti.NEXTTECHNICIANID=au1.USER_ID LEFT JOIN AaaUser ao ON wti.OPERATIONOWNERID=ao.USER_ID LEFT JOIN SDUser sdu ON wo.REQUESTERID=sdu.USERID LEFT JOIN AaaUser aau ON sdu.USERID=aau.USER_ID LEFT JOIN WorkOrderStates wos ON wo.WORKORDERID=wos.WORKORDERID LEFT JOIN ItemDefinition icd ON wos.ITEMID=icd.ITEMID LEFT JOIN SubCategoryDefinition scd ON wos.SUBCATEGORYID=scd.SUBCATEGORYID LEFT JOIN CategoryDefinition cd ON wos.CATEGORYID=cd.CATEGORYID LEFT JOIN StatusDefinition std ON wos.STATUSID=std.STATUSID LEFT JOIN WorkOrder_Queue woq ON wo.WORKORDERID=woq.WORKORDERID LEFT JOIN QueueDefinition qd ON woq.QUEUEID=qd.QUEUEID LEFT JOIN SiteDefinition siteDef ON wo.SITEID=siteDef.SITEID LEFT JOIN SDOrganization sdo ON siteDef.SITEID=sdo.ORG_ID LEFT JOIN WorkOrderToDescription wotodesc ON wo.WORKORDERID=wotodesc.WORKORDERID WHERE  ( ( ( wo.CREATEDTIME >= 1599849000000 ) AND ( ( wo.CREATEDTIME != 0 ) AND ( wo.CREATEDTIME IS NOT NULL ) ) ) AND ( ( wo.CREATEDTIME <= 1599935399000 ) AND ( ( ( wo.CREATEDTIME != 0 ) AND ( wo.CREATEDTIME IS NOT NULL ) ) AND ( wo.CREATEDTIME != -1 ) ) ) )  AND wo.ISPARENT='1'