Can not edit forum post

I seem to have lost the ability to edit a post I put in the sell section of the forums. I can edit this post after I put it up and others, but for selling I want to edit the main post, as some items may have sold or the price has changed.

What gives?

Account is many years old and I have some posts so it shouldn’t be that forum trust rating things right?

Edit-
This post:

Trade post:

I think they put a time limit on the edit this post option. After 5 minutes maybe.