RandomSpawns getting edged out by vanilla spawns unexpectedly.

So this is a bit weird, but on MM 5.4.0 build a9bc1237 with PaperMC 307 It would seem the Vanilla spawns slowly overtake the MM spawns and edge them out of spawning. As time goes on more Vanilla spawns appear and MM spawns are reduced to zero. I have no idea why. Here is the spawners config: https://pastebin.com/EhwZvfyn

Here is a video:

https://cdn.discordapp.com/attachments/1141958805840736377/1141958807543623751/Minecraft__1.19.2_-_Multijugador_terceros_2023-08-17_01-28-38.mp4

Kind of expected both MM and vanilla to spawn together. But instead Vanilla overtook the spawns and eventually dragged the MM mob count to 0