Anyone else getting a different PIP amount?

Hi,

The Gov.uk website says enhanced living is £87.65 but I have been told I will get £85.60
The Gov.uk website says standard Mobility is £23.20 but I have been told I will get £22.65 

I accept it's only £2.55 a week less but I just wondered if there is a secret another level of PIP?

My report says 18 months but I got awarded till November 2021 so that's a bonus - not sure if I should kick off a fuss about this

Still waiting for the back pay but the breakdown comes up with a different amount.  I want to make sure all is right because if I do get the enhanced who's to say that won't be messed up too?

ta