There is a lot of bug nowadays and I think it is one of them. It happened once.
- My creature was born with shield.
- It fought and lost it’s shield.
- I put a new shield on it but it did not appear.
Either the shield did not work ot it just did not appear for me. (Nowadays there is a lot of bug for me with not appearing things. If I remember correctly my opponent gave up, so it might be that he saw the shield. Or he had something better to do…)