No mobs spawning for me

Im on an aternos server and wherever i am no hostile mobs are spawning but passive mobs still spawn and hostile mobs spawn at my friends when im not there. I have made sure mob spawning is on, mob spawning is set to true, it is on hard and i have tried changing it to normal and nothing changes they still dont spawn. There are no plugins just datapacks but i know they dont affect it because i have used them for a while and they have worked fine as it has only stopped working today. Please help.