How to say “They swapped two number signs this morning, and customers kept joining the wrong queue.” in Japanese

In Japanese

今朝(けさ)、二(ふた)つの番号表示板(ばんごうひょうじばん)を逆(ぎゃく)に付(つ)けちゃって、お客(きゃく)さんが何人(なんにん)も違(ちが)う列(れつ)に並(なら)んでたよ。

Kesa, futatsu no bangō hyōjiban o gyaku ni tsukechatte, okyaku-san ga nannin mo chigau retsu ni narandeta yo.