Armor still breaks as fast as normal when I have unbreaking on it

Armor still breaks as fast as normal even tho I have unbreaking on it. Here I will show you a picture. In the picture I have unbreaking lvl 9999 but my armor still breaks but when I have unbreaking lvl 9999 on my tools and sword they do not even get damaged a bit. Here I will show you a video where I use my sword and in the video you will see that my sword does not get damaged.