Mobs are not spawning

Hello, I have a problem with my sponge server.
The difficulty is set to 3, but mobs also do not appear hunger do not drop at all. I think this difficulty is blocked even though I set it to 3 in server.properties.
Plugins:

Adminshop
Auction
CarrotShop
Command Signs Reloaded
FlexibleLogin
FoxCore
FoxGuard
Gameparkour
Interchange
LuckyPerms
MMCRestrict
Mega Menus
Nucleus
RedProtect
Spotlin
TotalEconomy
VillagerShops
WorldEdit

Mods:
backpack,
baubles,
bookshelf,
carpentersblocks,
chisel,
ctm,
durabilityshow,
endercore,
ichunutil,
infernalmobs,
inventorypets,
ironchest,
itemblacklist,
jei,
journeymap,
mantle, metallurgy,
silentlib, silentgems,
tconstruct,
thaumcraft,
thaumicjei,
bspkrscore,
treecapitator,
wailaharvestability

I’m using recomended verison of SpongeForge. Why they’re not spawning?

did you edit your server.properties to not allow mobs to spawn?
Line 12: spawn-monsters=true
Line 30: spawn-animals=true

i also recommend changing FoxGuard to GriefPrevention

My server crashes when I use griefprevention. Mobs are allowed to spawn

Ok. I found solution. My lovely hosting has deleted spawn-monster line after i add it. But hunger is not dropping.

Now mobs are only in nether. Why?

Ok I switched to griefprevention but mobs are still only appearing in nether

You seem to be using RedProtect as well as Foxguard and/or Griefprevention. Is this necessary?
You can try testing it without any of the above and see if mobs are spawning in the overworld; if not, then it’s a deeper problem - possibly caused by a mod, or server settings.

Even without these plugins mobs are only in nether. On singleplayer mobs are working perfectly fine.

Ok I fixed it. First I downloaded the world and played it on singleplayer then i uploaded it and it works