[ad_1]
Can you confirm that the only posts that will be sent to Buffer are those have been created or updated after the time that the schedule has been set up until 4:59PM and that the older posts will not be sent?
If you have configured the Plugin to send WordPress Posts to Buffer when WordPress Posts are published, that will happen (that is, WP to Buffer > Settings > Posts > Defaults > Publish > Enabled).
If you have configured the Plugin to send WordPress Posts to Buffer when existing WordPress Posts are updated, that will happen (that is, WP to Buffer > Settings > Posts > Defaults > Update > Enabled).
It has nothing to do with the schedule you’ve set in Buffer.