There are several reasons. Maybe the sound feature wasn't enabled when you were creating the story. Or, it could be a technical glitch with the platform or software you're using to access it.
It could be a problem with your phone's audio settings. Make sure the volume is turned up and that there are no restrictions on Instagram's access to your audio. Also, try restarting your phone to see if that helps.
It could be a problem with the source file of the story. Sometimes, the audio component can get corrupted during upload or download. Try accessing the story from a different source or re-downloading it.
It could be that the device you're using to read or present the stories has a sound issue. Check if the volume is turned up and if the device's audio functions properly. Also, make sure the stories themselves were created with sound enabled.
Maybe you accidentally muted the sound or your device's volume is turned down. Check both settings.
Maybe it shares common themes or tropes with other popular stories you've come across before.
Maybe it's designed that way to provide more engaging and context-rich interactions with you.
Maybe it's because similar themes or plot elements are common in many stories, and you've encountered them before.
Maybe it's a default feature or part of a recent update. Sometimes, these things happen without a clear reason.
Maybe it's a feature designed to engage users or provide some entertainment. That could be the reason.
Maybe it's a feature designed to engage you or provide some form of entertainment.