WordPress and/or Database creating multiple entries in database from single post

I am using version 2.7 and I have noticed a small problem with the latest versions, perhaps since 2.5. When I create an entry wordpress will give it a number, the first post is 1, the second post is 2 and so on. Except, my problem is that I will create a post and it will not follow the last post sequentially. For instance, this morning I created 5 posts (these are the only 5 posts created during this time) and the numbers that wordpress is giving them is 720, 722, 724, 726 and a few hours later 735.

I have taken a look at the database itself and it will show duplicates for each entry. 720-721 are the same, 722-23, etc… However if you go into wordpress and try to go to /?p=721 or any of the duplciates it will show nothing.

Any help would be appreciated and i’ll try to provide more information as requested.