Thread table does not contain all threads issue

Declare @count int 
 
 SELECT @count = count(*) FROM pgd_messages m where parent = 0  
     and not exists (SELECT messageID from pgd_threads t where m.messageID = t.messageID) 
 
 
 While @count > 0 Begin 
     Set rowcount 10000 
      
     Insert into [pgd_Threads] 
         (messageID, dateCreated, ForumID, totalReply, isTop,  
         hits, rating, isPoll, isFAQ, lastUpdate, lastMem, mem, login, subject, attachment, cashReward) 
 
     SELECT messageID, dateCreated, ForumID,  
         (SELECT count(*) - 1 from pgd_messages mm WHERE mm.threadID = m.messageID),  
         0,  
         (SELECT (count(*) - 1) * 300 from pgd_messages mm WHERE mm.threadID = m.messageID),  
         rating,  
         Case When exists(SELECT * from pgd_poll p where p.pollID = m.messageID) then 1 else 0 End,  
         isFAQ,  
         Case  
             When exists(SELECT * from pgd_recyclebin r where r.messageID = m.messageID) or m.moderated = 1 then ''  
             else (SELECT top 1 mm.dateCreated from pgd_messages mm WHERE mm.threadID = m.messageID ORDER By mm.messageID desc) End, 
         (SELECT top 1 cast(mm.mem as varchar(50)) + '$''' + p.login from pgd_messages mm inner join pgd_members p on p.mem = mm.mem WHERE mm.threadID = m.messageID ORDER By mm.messageID desc), 
         m.mem, p.login, subject,  
         Case When exists(SELECT * from pgd_upfile u where u.messageID = m.messageID) then 1 else 0 End, 0 
     FROM [pgd_messages] m inner join pgd_members p on m.mem = p.mem  
     WHERE parent = 0 and not exists (SELECT * from pgd_threads t where t.messageID = m.messageID ) 
     Order By messageID DESC 
      
     SELECT @count = count(*) FROM pgd_messages m where parent = 0  
         and not exists (SELECT messageID from pgd_threads t where m.messageID = t.messageID) 
 
     Set rowcount 0 
      
 END