Lag time on Index file add?

Hello All,
Here's a quick question.
1. AS400 Physical File that holds multiple comments for an order#.  The key to 
this file is (order#) + (3/0 seq#).
2. File has 1.7 million records in it.
3. File has ACCESS PATH MAINTENANCE(*IMMED) when I do a DSPFD.
4. Records are being added to this file and they do not actually end up at the 
end of the file until 5 - 8 minutes later.
Is this normal?  
TIA
Tim Truax
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