Where did the records go?

I experienced a strange thing happening on one of the tables I converted recently to InnoDB from MyISAM. When the table was using MyISAM, MySQL was reporting 47219404 rows in the output of

SHOW TABLE STATUS LIKE 'book_v2' \G

After converting the table to InnoDB and loading data using

INSERT INTO ... SELECT * FROM ...

I noticed that

SHOW TABLE STATUS LIKE 'book_v2_innodb' \G

reports 19265701 records and for the same table running

SELECT count(identifier) FROM db.book_v2_innodb;

returns

+-------------------+
| count(identifier) |
+-------------------+
| 19996851 |
+-------------------+
1 row in set (6 min 31.14 sec)

Now where did the remaining records go and why is MySQL reporting different value for count(identifier) than the number of rows in "SHOW TABLE STATUS" output?

One thing I would like to note is that the records were inserted after setting UNIQUE_CHECK and AUTOCOMMIT to 0.

<update</>
Another weird thing is (notice the number of rows):

mysql> show table status like 'guestbook_v2' \G
*************************** 1. row ***************************
Name: guestbook_v2
Engine: InnoDB
Version: 9
Row_format: Dynamic
Rows: 19265701
Avg_row_length: 305
Data_length: 5895094272
Max_data_length: NULL
Index_length: 1141899264
Data_free: 0
Auto_increment: 53756907
Create_time: 2006-07-24 20:40:23
Update_time: NULL
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options: max_rows=1000000000 avg_row_length=256
Comment: InnoDB free: 380928 kB
1 row in set (2.60 sec)


mysql> show table status like 'guestbook_v2' \G
*************************** 1. row ***************************
Name: guestbook_v2
Engine: InnoDB
Version: 9
Row_format: Dynamic
Rows: 19445335
Avg_row_length: 303
Data_length: 5895094272
Max_data_length: NULL
Index_length: 1141899264
Data_free: 0
Auto_increment: 53756907
Create_time: 2006-07-24 20:40:23
Update_time: NULL
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options: max_rows=1000000000 avg_row_length=256
Comment: InnoDB free: 380928 kB
1 row in set (1.02 sec)


mysql> show table status like 'guestbook_v2' \G
*************************** 1. row ***************************
Name: guestbook_v2
Engine: InnoDB
Version: 9
Row_format: Dynamic
Rows: 18951343
Avg_row_length: 311
Data_length: 5895094272
Max_data_length: NULL
Index_length: 1141899264
Data_free: 0
Auto_increment: 53756907
Create_time: 2006-07-24 20:40:23
Update_time: NULL
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options: max_rows=1000000000 avg_row_length=256
Comment: InnoDB free: 380928 kB
1 row in set (0.79 sec)

mysql> show table status like 'guestbook_v2' \G
*************************** 1. row ***************************
Name: guestbook_v2
Engine: InnoDB
Version: 9
Row_format: Dynamic
Rows: 18996251
Avg_row_length: 310
Data_length: 5895094272
Max_data_length: NULL
Index_length: 1141899264
Data_free: 0
Auto_increment: 53756907
Create_time: 2006-07-24 20:40:23
Update_time: NULL
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options: max_rows=1000000000 avg_row_length=256
Comment: InnoDB free: 380928 kB
1 row in set (1.65 sec)

Weird, huh?