Mobs not spawning, E too low

So I'm playing on this server for few weeks and I feel like after I killed the ender dragon mobs stopped spawning. When I'm in my village or anywhere else in overworld E is like 5 though I'm playing on hard difficulty. I tried chaning to peacefull and back that seemed to work, but it only spawned like 3 mobs. In nether and end everything seems to be working just fine gamerule doMobSpawning is true. Please help