Fantasy texture pack not loading in Realms

My realms server has been using the fantasy texture pack since I first started it. I logged in yesterday for it to be switched back to the standard texture pack. It still says it's activated but it does not appear in-game. I have tried different world saves on my realm and have been unable to get it to activate; however, when I play on a single-player copy I am able to get it to activate fine. All my other textures seem unaffected and can be applied without trouble to my realm.