In regular faction, my afk blaze grinder was acting very weird.
I spent about 30 mins afking and I got no blaze rods.
So, I changed it to a semi afk grinder.
I afked for another 30 mins and only 4 blazes were spawned...
No one in my faction was on so none of the blazes can be killed.
After that, I just decided to afk every 5 mins so that 4 blazes can be spawned.
I started to kill them with a sword ,but I didn't get any sword mcmmo levels at all.
I killed about 50 blazes or more by now and my Sword mcmmo isn't that high
Is this a bug?

 

Just checking, is it still like that?

 

The reason that is happening is because spawners behave strangely. They will only spawn a maximum amount of mobs within a certain radius(I think it's twelve), and after that it stops spawning.

 

Its not the server. Its how mojang and mobs run. Also blaze drops are low. :(
I hope this helped. Feel free to open a new thread if any other issues appear.
Locking and archiving.
~ KingAlex