InDesign CC 2019 - DataMerge

Hello,

Thank you for your time, here is my problem.

I am looking to print X100 books of 282 pages

Each Book with a unique ID number i.e. "Logbook no. 0123"

there are 3 unique instances of the sequence number.

1. Cover (number placed on MASTER A)
2. Title Page (number placed on MASTER B)
3. each and every other page - 275 pages (number placed with MASTER C)

When I preview the DataMerge sequence, everything behaves as normal.

The export to PDF takes, what seems to be, an appropriate amount of time.(100 books X 282 Pages...a few hours)

After all the number crunching, the HUGE PDF is 28,200 pages (which is right)...but each copy has the first number in the sequence?!?!?!

Each book in the new PDF is marked "LogBook no. 0101".

Data is CSV Comma Delimited - 0001,0002,0003, etc...
I have not tried to create "Merged Document"
I am specifying a range to print - 0101-0201

I've done this twice, now I am officially stumped

Any help would be greatly appreciated

Thank You