At the bottom of every forum's index page is a few drop-down boxes that determine how many posts you see on that index page.

While most forums are set to the same timeframe (typically a year), other, more fast-moving forums like Kudos are set to smaller timeframes. Kudos is set to 2 months. If you change that time frame to be "from all time," you will see all posts in the forum.

DocJohn