Reactions or tags only shown for a specific user


We are trying to set up Nextcloud, but we have some strange things.

If one user looks inside the nextcloud webpage to a specif foto, he can make a reaction or attach a tag to this photo.

But if an other user also visits the same page with photo : he does not see this reaction or tag

Any idea what the reason can be?

Thank you for the reply

extra information : these photos are stored on a SMB/CIFS folder

Is this normal?