Help understanding ESA letter?

Hello all, I'm struggling to understand my ESA decision and was hoping someone could dumb it down for me in plain English (something these forms fail to do)

i am currently receiving ESA my letter states as follows:

Your living expenses: £73:10
Limited capability to work addition
Extra Money because you are in the Support group: £36.55
Which gives a total Income-related amount: 109.65

Income and Benefits

No income will be taken off your Employment and Support AllowanceYour income related amount is £109.65 less £0.00 so you would have been entitled to
How ever because you are entitled to contribution based employment and support allowance we will pay you: £109.65.

Now this is where I'm completely lost..if i am in the support group and contribution based ESA why am i receiving an income related amount? also will this affect me as my partner works more than 30 hours a week, or am i confusing myself? any help would be GREATLY appreciated!

Thank you!!