What are the events you are using?

what would happen when you return "Back to the goal" (I assume you are talking about the exit, right?) If it warps right away to the next level, that's the "secret level bug"

From what I can see here, here are the ending event in JCS:

In Gameplay/Area: (With these, the player walks past them)

Area End Of Level
Area Warp EOL
Area Warp Secret

In Gameplay/Signposts: (With these, the player shoots them)

Bonus Level Signpost
End of Level Signpost

In my expiriments with these, the "area warp secret" is the only one that gives the symptoms you described.