Another long-standing problem of the server are its outdated resource packs. Specifically the one in Zambies. As you can tell, that red box shows it's outdated and not fit for 1.12.2, let alone any update after that. The one in Shoota isn't like that simply because the resource pack is embedded in the server and will automatically upload itself. No doubt it's just as outdated as that one in Zambies. So, staff (or the owner at least), fix this problem. Soon enough, it won't be able to function right far enough into the future updates.