Pointless downloads

Hello everyone, I have a question regarding my Steam Deck, I notice that when I turn it on it downloads "something" of the games I have installed. It usually happens after being turned off for a few hours. They are not heavy downloads, but there are cases where they weigh about 500mb. They are not current games to say that they are receiving updates and I am not subscribed to MODS from the Workshop. Unlike Steam on PC, it doesn't allow me to see what the download/update is about, if it did this post wouldn't exist :p