The phrase "being on a different wavelength" is an idiomatic expression used to describe a situation where two or more people have difficulty understanding or communicating with each other because they have different perspectives, attitudes, or ways of thinking.
In the context of interpersonal relationships or communication, being on the same wavelength means that people have a mutual understanding, share similar thoughts, ideas, or have a compatible mindset. They are able to connect easily and communicate effectively because they have similar viewpoints or mental frequencies.
Conversely, when someone is described as being on a different wavelength, it implies that their thoughts, ideas, or way of thinking is incompatible or divergent from the person or group they are being compared to. They may have difficulty understanding or relating to each other due to these differences, which can lead to miscommunication, misunderstanding, or a lack of harmony.
Overall, the phrase is figurative and is used to illustrate a mismatch in understanding or compatibility between individuals or groups.