If you mean e-mail notifications, your provider might have made some changes. Check your spam folder, I've had e-mails from itch.io land there semi-randomly.

It sounds like you are still receiving notifications from you other post. We have made no changes to this part of the site that could cause an issue like this.

Just so you’re aware though, if you view the notifications page on the site then it will cancel any email notifications that may have been queued.