This can be happening for too many reasons, hence I recommend joining the discord and checking the channel #faq. Make sure to check out and follow the video of how to set up Portal for speedrunning: If it is still not working, I recommend asking in the help channel on our discord server, there are many more people there to help, but we do ask for the basic research to be done. Hope it helps!
hey man, if you're still having problems i think you're comparing it to real time rather than game time. i had this problem but just switching that over will solve all your problems.
Starting today, runs that require video proof (top 25) and runs beyond that where video is the only form of proof, now require audio, as recording audio for only the game is now a native OBS feature.