Pointing to the video still doesn’t say how yours is configured. How yours is specifically configured may show why. In the video the transaction group is doing what its supposed to. They have it set to continuously trigger when the trigger item meets certain conditions. So every second it makes a new entry. If they checked “Only execute once while trigger is active” then it should only make one entry per trigger.
Just a word of advice when asking for help on here, I wouldn’t point people to a video, most people that are on here replying, are trying to help but do not work directly for inductive. The more info you can provide about your specific case, that can be looked a quickly, the more likely you are to get a useful reply. Most of the time when I see someone post a link to a video and say its like that, I just move on because I’m not going to take the time to watch a video to see how something is set up, especially if its not a video of yours specifically. I jump in to post replies to help when I have the time to but its normally a limited time I have to look at whats here and do a reply.