Reports randomly "miss" records

Question

Background:
I've made a report that I send to customers.  From this report, I've made a summary report that's literally a copy of the first report, but most everything is suppressed except for one section of the original report.  Again, from the main report, I've made another report that is basically the summary report, except it outputs all the information in a specific format so I can upload it into my financial system as a flat file.  Other than all the suppressed sections there are a few layout changes and such, but nothing that should affect the data, they way it's sorted, etc...
The Problem:
The 3 report's summations don't match up all the time.  I'd say they are 90% correct.  I did some expanding to find out that the reports randomly drop a record of data here and there.  They are terribly small differences too because a record is usually only a matter of cents, however this makes it hell on us because we can't rely on the summary to match what the customer sees which may not match the upload into our financial system.
More bad news:
It appears to be random and it isn't just one report that does it.  Sometimes the customer receipt misses a record and the others don't, sometimes the summary misses one and the others don't and sometimes the upload misses.  You get the point.
I've gone through the SQL queries that are created and they are literally word for word.  They match 100%, even the order of everything (which was to be expected by using a copy of the receipt for the others).  Also, at first glance, all the options are the same as well.  They pull from the same DBs using the same links.  All filtering is in place and all match.  Finally, the records read always match up after the reports finish, so they are obviously all pulling the data.
I'm stumped and have been working on this for toooooo long.  I think it's time for some fresh minds.  Anyone?
Darren

Answer 1

some answers:
Yes, there are occasional null values in reported fields, but all 3 reports get the same values and I believe all reports have the same fields shown.  Will have to take a closer look to make sure.
Yes, I do rounding here and there, but again every report does the same thing at the same places.  The rounding is done after the summations of the records occur.  Theoretically, it shouldn't affect the records themselves.
Yes, the dropping of records is repeatable.  I can refresh the report and the same records are dropped every time.
Here's the SQL from the main receipt report, but I warn you, it gets pretty hairy.  There are many tables that need to be joined across multiple databases.  Nothing should be confidential.
LOCAL
SELECT "MC_Call_Infos"."Extension", "MC_Call_Infos"."Cost_0", "MC_Call_Infos"."Date_Time", "MC_Call_Infos"."Dialed_Number", "MC_Call_Infos"."Dest_Description", "MC_Call_Infos"."Wait_Time", "MC_Call_Infos"."Ring_Time", "MC_Call_Infos"."Talk_Time", "MC_Call_Infos"."Hold_Time", "MC_Call_Infos"."Source", "MC_Call_Infos"."Account_Code"
FROM   "MicroTelCall"."MICROTEL"."MC_Call_Infos" "MC_Call_Infos"
WHERE  ("MC_Call_Infos"."Date_Time">={ts '2008-12-01 00:00:00'} AND "MC_Call_Infos"."Date_Time"<{ts '2009-01-01 00:00:01'})
ORDER BY "MC_Call_Infos"."Extension", "MC_Call_Infos"."Date_Time"
EXTERNAL JOIN MC_Call_Infos.Extension={?LOCAL: MC_Extensions.Extension_Number}
LOCAL
SELECT "MT_Divisions"."Name", "MC_Extensions"."Note_0", "MT_Departments"."Name", "MC_Extensions"."Note_1", "MC_Extensions"."Extension_Number"
FROM   ((("MicroTel"."MICROTEL"."MC_Extensions" "MC_Extensions" INNER JOIN "MicroTel"."MICROTEL"."MC_Employee_Extension_Tags" "MC_Employee_Extension_Tags" ON "MC_Extensions"."Sequence"="MC_Employee_Extension_Tags"."Extension_Sequence") INNER JOIN "MicroTel"."MICROTEL"."MT_Employees" "MT_Employees" ON "MC_Employee_Extension_Tags"."Employee_Sequence"="MT_Employees"."Sequence") INNER JOIN "MicroTel"."MICROTEL"."MT_Departments" "MT_Departments" ON "MT_Employees"."Department_Sequence"="MT_Departments"."Sequence") INNER JOIN "MicroTel"."MICROTEL"."MT_Divisions" "MT_Divisions" ON "MT_Departments"."Division_Sequence"="MT_Divisions"."Sequence"
WHERE  "MC_Extensions"."Extension_Number"={?LOCAL: MC_Call_Infos.Extension}
ORDER BY "MT_Divisions"."Name", "MT_Departments"."Name", "MC_Extensions"."Note_0"
I filter by date.  Only other filters are for the subreports that filter based on the department that the main report is currently compiling.  I do in line filtering of any records that aren't valid at run time.  So any records that are $0.00 or below and any records that have "false" numbers.