When the setting for the texture packs is enables instead of loading the desired texture packs it loads the Minecraft default instead. My custom resource pack (setup via Spigot) comes back after logging out then back in. I tried using your defaults (which seemed real when I downloaded them via http) and also created a modified version of your bloodmoon.zip on my server but same issue. I am running Spigot 1.8.8 from BuildTools and your latest build of BloodMoon.