Posts missing when archive or category is selected.

(www.damnjezebel.com/diary – fair warning, alot of the stuff I post is 18+ and NSFW)

I’ve noticed that when I access my archives, it only allows me to go back to around 20th-21st – nothing before that date (ex: so October 20th would be the last date on the page). I’ve also noticed that my categories do the same thing. There’s nothing at the bottom of the page, like “previous” or “next page”. Does anyone know how I can remedy that?

I’m running WP 1.5, btw.

Thanks in advance!