I noticed that too, it sure does seem really strange. I noticed an error in an old post, and could not change it. This is not very common in most other sites I peruse. Sometimes a link needs to be changed or corrected to, not just correcting grammatical errors.
I don't really think there needs to be a time out on editing, or at least it should be a day or two.
2017 Escape 5.0 TA (someday soon, I hope
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln