Maybe it's because I'm new, or something, but on this game that I made, (immune response) there's this button, when that button is pressed it broadcasts to a sprite, when that sprite gets the broadcast, it shows but then immediately hides. Is there a reason for this to be happening?

Itll help if we have a link.
But, it seems to me like you need to detect if the sprite has a “forever, hide” loop in it.

here:https://scratch.mit.edu/projects/741069965/
the project is on my profile too, but I guess you didn't check there for some reason, even though I said the name of the game, and said game is shared.

here's an image of the code:

what button broadcasts the message and what sprite receives it?
oh wait nvm I saw the picture

It appears the issue is that it goes behind the effects sprite. I remixed it: https://scratch.mit.edu/projects/746197346/
It appears to fix it.