The video that was posted wasn't getting deleted, it was just hidden. So technically, there were still 10 videos, even though you couldn't see them. I completely forgot to turn this function on after testing it. I increased the limit to 20 videos and fixed this issue, shouldn't be a problem anymore (the game is updated). Thanks for pointing this out!
Also, there will be a task that creates a video and posts it on LustLink for you. This whole process will be much easier.