Broken texture and behavior pack settings

Hello, about two weeks ago, I created a realm to play with friends and roleplay, and we came up with the idea of ​​looking for a texture pack that changes some armor, for a police uniform, the fact is that we downloaded an addon that did that perfectly but when entering the realm settings and applying that pack, it was not applied, we tried with others and ended up breaking the texture and behavior pack settings, without letting us add or remove any, and although it appears that there are none When joining, ask if I want to download a 7.3mb pack, which contains nothing but sounds and Fortnite textures (we never downloaded that) and lists it as "miscellaneous" and not as a texture pack