LOL, no your post count goes up in all your posts every time you make a post, regardless of when the original post was made.
The general rule is that a post must be a good post in order for it to count, so if you're not making good posts they don't count.
with you. Certain forums such as Aquarium Off Topic and the Watering Hole don't count towards your post count, so you can make dozens of posts in these forums and you will not see your post count increase. Beyond that we are checking to see if anything else might be going on.