Is the pally Tank really taking double the damage over the monk?

https://www.warcraftlogs.com/reports/Nxr76B93AhqbvDtM#type=damage-taken&fight=last

How do you read the bar? (blocked/absorbed/blocked/stagered)
Why does the bar not match the DTPS?
What does the mitigated stat mean exactly?

I googled it and haven’t really seen anything that explains the damage taken info