sum of is null and is not null query doesn't equal total

Hello, I run 3 queries. The first get's everything from a table, the second get's everything from that table that isn't in another table, and the third get's everything from that table that is in another table.

Query 2 + Query 3 should equal Query 1

Here are the queries:
/*query 1*/
select count(*) from location

/*query 2*/
select count(*) from location
left join carton
on location.facilityid = carton.facilityid
and location.loctypeid = carton.loctypeid
and location.locationid = carton.locationid
where location.loctypeid = 'p'
and carton.cartonid is null
/*query 3*/
select count(*) from location
left join carton
on location.facilityid = carton.facilityid
and location.loctypeid = carton.loctypeid
and location.locationid = carton.locationid
where location.loctypeid = 'p'
and carton.cartonid is not null

my result is:
595413
552299
101712
How is it possible that there is more than the total? Thanks in advance,

Ben