Ring Sound dont be aktivated?

Hello,

Sorry vor my Bad englisch.

The Auto Unlock bay my iPhone works gerate. I use the Ring and ist Open. And the Ring dont make normal Sound. I use the opener Sound.

but by my girlfrend she use a iPhone too and hase aktivated auto unlock, but ther is normal sound from the ring.

And by the normal people the sound is deaktivatet top. Ther it works. Only by my girlfrend ist ringing normal.

Bug?