I'm not sure if it's been implemented yet but Admin has talked about limiting moderation of a post to 72 hours. The change or limitation in edit time was designed to stop some members from going back and editing/deleting many or all of their posts when they want to take their ball and go home. The problem it left was many topics and conversations were disjointed or rendered incomprehensible with several key posts removed or edited down to "xxxxx." Based on the dates in your topic, I am assuming the 72-HR rule has been put in place and that prevented you from being able to edit a post over 72 hours old.
I went in and deleted your "XXXX" post from May 2018 so that's not cluttering up your topic. Hopefully this helps some.
Forgot to add; my editing and comments were for this topic (see link below).
Montana hunting leases