This is occurring upon edit AFTER publication or scheduling. Creating a brand new post works just fine.
Subsequent edits will blow away the greenlight. See the following examples:
You have not used your keyword / keyphrase in any subheading (such as an H2) in your copy.
The keyword doesn’t appear in the first paragraph of the copy, make sure the topic is clear immediately.
The above redlights did not exist until AFTER edit of a scheduled post. The same thing occurs with published posts.