Any links built to sites that you/we own are completely under the control of webmasters. In all of our link building, we verify if the link is live every 24 hours. Most smaller deliveries take 2-3 days to complete. In this time, we may only have 1-2 times to verify your links as live.
During the down periods, webmasters often clean up any comments, articles, posts that do not seem 100% authentic - we always aim to post to high quality sites, and as such, they have high quality standards which your posts may not meet.
Not all of your links will survive, but rest assured, they were verified as live upon initial check. Many of these links that survive will go on to be indexed and become a part of your link portfolio for your website.