Decision Letter

Hi Everyone 
Hope you're all staying safe and well 
I recently got my decision for my assessment. And I'm a bit unsure about something, In the letter.
It says that any extra payment, will start, from the 3rd month, of receiving my evidence.
I sent my  fitnotes in on 18th November, and 13th January, both for  2 months. 
My Universal Credit payments, are from January 26th to February 27th
And paid on the 3rd of March, so I wondered when, and If, my extra payment will start from.

Thanks In advance, for any advice