I may be a little late to the party but why can Obito and itachi hit those who are cloaked in Anbu with their mystery attacks?

Thanks for getting back to me. Well Susano Itachi can still cause chaos and Obito can still cause immobile. For example: I just finished a arena fight using LM, Dariu,Anbu Itachi and Anbu Kakashi. LM and Kakshi was under the Anbu cloak. The other team with Susano Itachi, FM, Masked Man Obito and Shisui used Chaos on Kakashi to stop me from using his mystery and Obito used Immobile on my LM. Is that suppose to happen? If so then the Anbu cloak would not be immune to all mysteries. This was at the beginning of the fight. I do realize they can still get hit by normal attacks.