Untouchable mobs in realms

Hello, I would like to say that this morning I bought the realms + subscription, and obviously I created a realm. There is a problem, however, because the world loaded into the realm is a mini server (so cheats are activated and trophies are deactivated, in case this information is needed), but the mobs cannot be hit! It could rarely be done, but when I tp myself in a distant place or changed gamemode (at least that's my impression) they became "immortal". While there are, I would like to ask you if there is a way to create more than one realm.