possible evil box glitch?

You do realize this event comes straight from KMS, right?
This isn't a GMS original like the Evolving Belt.
So your use of "they" and "Nexon" is vague enough for me to say, no, they don't "always screw up somehow".

that's why i posted this in response to another person doubting how the system worked in page 5:

copypasta from jms, they may not even know they did it

sounds plausible.

i find it hard to believe for nams to go out of their way and make the system, when it's much more plausible they simply copy pasta'd it