Rescheduled posts are not reappearing at the front in reader

Hi,
I am running a self hosted blog which is connected with wordpress via Jetpack pluggin.
The published posts are appearing in reader normally. But whenever I update the published time to a future time, posts are not reappearing at the front in reader even after the scheduled time [ I wait for an hour, still it’s not showing up]. Instead posts remains in the initially published time stamp itself in the reader. But the admin page is showing the latest published time itself for the post. I would like to have my posts reappear at the front in reader after a reschedule.

I have scheduled a post today morning 8 AM IST and it was published on time. Now half an hour before, I rescheduled it to 12.02 PM. The admin shows it as published a few minutes back though in my reader it is still hours back published post. It hasn’t appeared in the front in the reader

[While I was on a free wordpress site, i had no issue with this rescheduling. but the issue started with self hosting only]
Expecting your support to rectify my issue.

thanks
Akhila

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