It's probably because of the date for that thread is past x amount of days, and that's why you need to go to newest. That's one possibility. Also, make sure that your subscription is to the forum instead of just a single thread.

__________________
Sheikahchica is my amazing ZU girlfriend <3 | Thank you to Blackfeather for the beautiful set.

DK : "I thought you were taller than that. It's going to be much easier to wrestle you to the ground in a completely homosexual way when I see you."