Mobs not spawning in Realms

A few friends and I are using a realms world on bedrock edition. We had no issues with mobs until about a week a go. Animals are spawning in maybe 1 sheep or 1 horse a Minecraft day and nether fortress (removed all lighting) has only blazes and pigmen spawning. No wither skeletons or ghast. This is causing us to not want to play sense animals are no longer spawning and can't attempt to fight wither.