TOPIC: Member's Numbers?

Hi there!

In the backend when I try to edit the members (group registration type) I can see the sequential numbers of the members, but that numbers have the values of the registration order.
If this member is 13th (of, say 25) in the total number of registrants the values will be as following: 13 (of) 25
But if I delete some records in the middle the next record's number will have the next value (14).
The question is, what's going to happen after this value will reach 25 of 25, but there will be some available seats in the event due to the deleted in the process records?

Say I had 1,2,3,4,5,6,7,8,9,10 records (of 25)
Then I deleted 4 and 5
The next record will have 11 ...etc. value untill the 25
After that I will have 2 available seats, right (deleted 4th and 5th records)

Will the following records have 4 and 5 values?

Crazy numbers...

After I reached the 25 of 25 members (with some records deleted in the middle)
I'm getting the following values

21 of 27, 22 of 27, 23 of 27 for one group of registrants and 19 of 25, 20 of 25 for another group (the same event!)
What does the 27 mean? I have 25 seats...

Don't have a clue...