Burn calculation on Inferno Khawazu appears very off

[cryptokoala4]

Burn calculation doesn't appear to add up. Have attempted the following inputs, a standard 4900 damage infero khawazu:

Spoke with some guildies and apparently it's supposed to be the following:

Then another guildie chimed in and states the additional following:

All agrees the math for burn on existing website doesn't make sense.

Side note: iron fans is reworked, no longer gives damage.

[cryptokoala4]

Closed, as the calculation seems to be correct since we should be setting 4 burns instead of 2 due to detonation working based on number of turns remaining