Not changing anything in the game from what I can see, just minor visual bug apparently. - Video Tested that build in custom to see if it happens again and it does. Also doesn't seem to matter, if you leak the boss or not. Repro: Custom game Wave 10 Send Mercs Leak To repro you apparently just need to damage the units. I placed a single Deathcap for aura and had a couple of gold pop ups. I set gold to 0 and got only the +6 from the boss damage. +1 from dino etc. were not granted, so it's just visual.