どういうわけか

for some reason

→ どういう
phrase Rare #32,391
for some reason Used when the speaker does not know or does not explain the reason. It can also mean “somehow” depending on context.
JA: どういうわけか、今日は電車が空いている。
EN: For some reason, the train is empty today.

どういうわけか遅れている

For some reason, it’s late.

昔を思い出すどういうわけか母が君の顔になってるんだ

When I think back to the past—for some reason, my mother’s face becomes yours.

— 鏡 (1975)

どういうわけか彼女は僕にひどく怒っていた

For some reason, she was furious with me.

彼はどういうわけか人気がない

For some reason, he's unpopular.

どういうわけかメールにアクセスできませんでした

For some reason, I couldn't access my email.