Our bot limit the maximum ROI of each round in 10%. Also we do not allow negative ROI and we give a minimum of 1% positive ROI. Sou a bidder may receive a ROI between 1% and 10%. Because of this new feature, Steembottracker is being fixed to show the real % ROI at the end of the round. In fact, I have already fixed it but Hive account@yabapmat, which is the original owner of the code, did not have time to commit it.

That information is public in the header of our steemit account: https://steemit.com/@brupvoter/
Please, any doubt you can call us in discordapp chat at brupvoter account.
Best regards,
Hive account@brupvoter team.