100% loss free bot means there will be no negative return.
Now we examine your bidding round.
@kgakakillerg , @pml2020, @herochemist and @ultraspace bids were accepted & these bids are total of 0.66 SBDs but some other bids were rejected & refunded due to 100% round full, @angryman's 0.50 SBD bid was also rejected & refunded but steembottracker didn't count that action so they show negative return. Total of 6 bids were rejected & refunded as you can see here.
Here is the proof
https://steemd.com/tx/50fcda73003f8d7d0d983688e2a12ca7345c7a82

Thanks for approaching us about this issue ♥