Nah, They're just repeating the same miscommunication issue as before, even though they've already resolved it once. It should have been a lesson for future communication to avoid the same misunderstanding, but they ended up repeating it again.
Honestly, this is more about how the author has written the storyline. Well, maybe that's just the way it needs to be.
Maybe this is just a manhwa, so it is what it is.

Two guys are in a relationship, but they always misunderstand each other’s thoughts. Usually, their funny mix-ups keep things light, but this time it’s serious and could lead to a real fight. As a reader, it’s frustrating to watch them get tangled up in miscommunication. They’re not even women; they’re two men trying to figure things out, which makes the situation even more complicated!