I mean, it's a bit better than that don't you think? (〜￣△￣)〜
Lady Bolshake's misunderstanding is fine and compared to Ain's mother Lady Bolshake actually give the Duke the benefit of a doubt and is starting to become more open towards him (baby steps).
Ain's mother didn't misunderstanding, it's from her POV from her past life so that's why she scares of the father, while towards Ain, she didn't know the truth so she just simply try to grow him like normal kid and hope he happy, ok?
Moreover, the misunderstanding in this story makes it funny and when it solves, their love will bloom, which absolutely different from another, so there is no point to compares these two!!!
If ya'll think that FL's misunderstanding is annoying as hell, I think we can all agree that the FL from "I became the Villaine's Mother" (something like that) Ain's mother can top our FL when it comes to annoying misunderstandings. Ain's mom annoy the hell outta me ugh #－.－)