зависит от контекста 错 = 不对 = 冤枉 不对头 это про неправильно в смысле неудобно

错 means sth is incorrect. It equals to 错误 不对头means that you sensed sth or some kind of situation is getting weird. It means sth is getting out of sense.

不对头 is more subjective. You assume something is strange and impossible you could say it is 不对头。 And 不对头 is informal. A law-biding man sneak into his flatmate's room. You could say the whole incident is 不对头。 The forecast say today is a sunny day, but you see the clouds gather in the air. you could say : 不对头啊，it should be sunny! You brought a bottle of water and it cost 2 yuan, you gave the seller 5 yuan and you left the shop without getting the change. A hour later, you notice you have lost 3 yuan , but you don't know where you lost it. you may say 不对头，it should had 3 yuan left in my wallet! Sorry about my poor English, hope it could help.

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错 literally means "wrong", with a/an strong/absolute emotion. 不正确 literally means "not correct", and is softer compared with 错. 不对 literally means "not right", which is similar to 不正确. Concerning the 不对头 you've mentioned, I think it's originated from 不对, and typically used in some specific regions in China. Similarly, we have 不对劲、不对劲儿 in Chinese. You could say them, all of which refers to 不对. Plus, if you are trying to be more polite, you could say 不太对, meaning "not very correct/right" literally. Let me know if you have any further question.