First, make sure you've watched at least a minute of the livestream, if you've only watched 30 seconds, we'll only capture that 30 seconds. If this doesn't solve the problem, please open a Ticket with the issue so we can work on fixing the problem with you.
Also on Twitch, the captures are approx. 60 seconds. We target 60 seconds but have seen this range from 54 to 90 seconds.