This typically happens when a collection in two cases:
The mint is opened, but the creator hasn't set the
The creator updates the metadata url after some tokens have been minted
If this is the case for your collection, you'll just need to refresh the metadata of the tokens since they were pulled into our site without metadata. Any user can refresh a token's metadata by navigating to the asset page on Quix/Stratos and clicking the "Refresh Metadata" button in the top right corner.
If you believe something else is wrong with your collection's metadata, please open a support ticket within our help center.