I wrote every word I could think of to do with the characters, the setting and just knights in general.
At one point I wrote "knight errant", and then I went "hang on a sec..." and sat and thought about it. A knight Errant is a knight who goes off on a quest, and we associate the word "errant" with knights... but the other way we commonly use the word "errant" is to mean something that's gone astray or isn't doing what it's meant to, and often carries a slightly comedic tone like "searching for my errant wife", "he was trying to get the errant remote that had fallen between the cushions.". So "Errant", just on its own was a title that gets across dysfunctional knights, and the single-word title hints at the modern setting and sitcom-like vibe too, because it sounds modern and a bit sitcom-esque.
My next thought was "...somebody else must have thought of this title. This can't be free, there must be another comic called Errant", but I googled it, searched Tapas and... rejoiced!