Why "was wrote" strikes the wrong chord in english

What kind of error is it?

It's a grammatical error involving the misuse of verb tenses.

Why do people make this mistake?

People often get confused with English past tense structures and mistakenly use "wrote" (the simple past tense of "write") in combination with "was", which is unnecessary because "wrote" already indicates past tense.

What is correct?

The correct form is either "was written" for passive voice or just "wrote" for active voice.