PS4 Mother slime possible glitch?

So here goes, I think I may have encountered a bug, I have built an underground corruption farm in the cavern layer, where mother slime is SUPPOSED to spawn, however, when my summoning units are killing, I'm getting up the number of enemies nearby and then obviously how many I've killed however, every so often it comes up with "kill count unavailable" so I try drop down to see what that enemy is, and there are baby slimes, so I kill those, and they too are 1. Not showing as the name of mob killed, and 2 also saying kill count unavailable, can anybody shed some light on this, or am I right in assuming mother slime has been removed?
Thanks
 
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