違ってた

was different, was wrong

→ 違う
違っ be different, differ + Te-form (conjunctive) + Past tense
verb · past indicative Rare #29,594
was different Casual contraction of 違っていた.
JA: 二つの答えは違ってた。
EN: The two answers were different.
was wrong Casual contraction of 違っていた.
JA: ごめん、私の記憶が違ってた。
EN: Sorry, my memory was wrong.
Conjugation of 違う
Indicative past
違ってた

僕達はお互い違ってたけど共通の何かを持ってた

We were different from each other, but we had something in common.

— ピエロがお前を嘲笑う (2014)

予想とは違ってた

It was different from what I expected.

— ラスト、コーション (2007)

意見が違ってた

Our opinions differed.

— ア・フュー・グッドメン (1992)

はじめ彼は先生って思ってたけど違ってた

At first, I thought he was a teacher, but I was wrong.

それが違ってた

That was wrong.

— 落下の解剖学 (2023)

そのとおり最初は違ってただろ

Exactly. It was different at first, wasn’t it?

— ザ・マン・フロム・アース (2007)