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Whizbang's Workshop Set Cards List & Guide
Sounds like a bug to me. There's really nothing to suggest here that it should have some secret interaction keeping it from triggering twice.
Click on the buttons to change the PopCard background.
Click on the button to hide or unhide popcard elements.
Sounds like a bug to me. There's really nothing to suggest here that it should have some secret interaction keeping it from triggering twice.