#32 NTX index does not work under some conditions

I have modified indextst.cpp test program like below:

WAS:
cout << "Populating database and indices with data"
<< endl;
cout.flush();
for( int i = 0; i < 10000; i++ ){

CHANGED TO:
cout << "Populating database and indices with data"
<< endl;
cout.flush();
for( int i = 55; i < 123; i++ ){

As you see, I changed range for the loop.

And now I'm getting error while doing integrity check:

Creating test database and indices
Populating database and indices with data
. Done.
Testing NTX index 1 Checking NTX IXNTX1.NTX
Exiting with rc = 0
OK
Testing NTX index 2 Checking NTX IXNTX2.NTX
Record number 67 Not Found
Key = 121 121
Error -114 with index intx2
Testing NTX index 3 Checking NTX IXNTX3.NTX
Exiting with rc = 0
OK

I have checked it under MSDOS using Digital Mars
Compiler and under Unix using gcc 3.4.2