Within any forum post, at the top of the page, under the first post, there's an option as to how you want to sort your posts:
X Comments sorted by Votes Date Added
If you change this, it will stay changed until you change it back. It sounds like you're sorting by Votes instead of Date Added. Just click on Date Added to sort in chronological order.
Comments
X Comments sorted by Votes Date Added
If you change this, it will stay changed until you change it back. It sounds like you're sorting by Votes instead of Date Added. Just click on Date Added to sort in chronological order.