There has been a shield breaking bug for quite some time, where sometimes your shield doesn’t work at all, you can see it there like you have it out but no one else can see it. It’s been such an annoying bug for quite some time.
Tonight, I figured it out! It happens if you grab your compass while you are mounting up, it seems like your shield is still out but it somehow stops it from working, no one else can see it but to the person that did it, it appears normal, please fix this in reborn <3