Animals dissappear

Since I opened the Realm with a friend, our animals dissappear, first was a goat wich was on a farm perfectly sealed for no escaping, it dissappear, next was a donkey with a nametag, this one dissappeared from nothing, it was on a farm protected and just was gone, then it happened with a horse, with armor, nametag, we lost those items and today on a wool farm 7 sheeps dissappeared same as a goat we got on the farm, is there anything we can do about this?