Odd, key details were left out or just not explained, for sure. There was a ton of lore you would just need to know before watching the movie to understand all of what you were watching.
Weirding modules are at the top of that list. Either didn't go into depth in the movie and I completely missed them, or they were just cut completely. Of all Dune lore, those were always super odd to me and didn't even fit in the original movie from years ago.