Another reason might be that you used a low-quality filter or editing effect that made the story look blurry. Try posting without any filters or with different ones to see if it makes a difference.
Maybe the image quality you uploaded wasn't good. Or your phone's camera settings were off.
Maybe your phone's camera quality isn't that good or the lighting conditions weren't ideal when you took the pics for the story.
Sometimes it's due to the quality of the original content you uploaded. If the picture or video was taken with a low-resolution camera or in bad lighting, it'll show up blurry on Instagram stories.
Maybe you didn't describe the details clearly enough. You need to focus on specific events and characters to make it sharp.
Another reason might be that the original photos or videos you uploaded weren't of high quality. If they weren't clear to start with, they'll look blurry on IG stories. Also, sometimes the IG app itself might have glitches that affect the display quality.
Maybe your camera settings are off. Check if the focus or resolution is set correctly.
Maybe the picture quality of your story wasn't good to start with. Or it could be a problem with the platform's compression when you uploaded it.