slime spawners don't spawn

[tiemob1]

I placed some slime spawners on my island and when i got back 12 hours later afk i got no slime spawners but all the other spawners had like 20 times 999

 

[usserwout]

Slimes spawn in the Overworld in specific "slime chunks" below layer 40 (or between 50-70 in swamp biomes) regardless of light levels.

 

[robertkoolcar]

just make sure the lighng and everything is right after that i cant rwally help