strangely, oddly
Il se conduit parfois bizarrement.
He sometimes behaves strangely.
Et bien, la vérité peut sonner bizarrement quelquefois.
Well, the truth can sound strange sometimes.
— Ratatouille (2007)
Les fleurs ont repoussé, mais bizarrement elles ne sentent pas.
The flowers have grown back, but strangely they don't smell.
— Stalker (1979)
Bizarrement, je ne ressentis absolument aucune douleur.
Strangely, I felt absolutely no pain.
Oddly enough, he failed.
Parfois, il se comporte bizarrement.
Sometimes he behaves strangely.
Il se comporte bizarrement ces derniers temps.
He's been acting strange lately.