Product Navigation and show results problem

[anzar]

Hi,
I have 36 products in category.

product name are like : 1, 2, 3, to 36

The problem is after the product 9th when i am creating the 10th product its coming first in product page.

What i need is 1,2,3,4, to 36
but its cuming like : 10,11 to 1, and then 21,22 to 2, and then 31,32 to 3 so my product page is looking like : 10, 11, 12, 13, to 3

plz help me to fix this problem