Change colour of pixel brush stroke

[cje 2]

Hi, 

I've made a master pixel brush stroke in a selected colour, which I've duplicated into several copies. I would like to change colours on the duplicated copies. 

After reading and testing for a while I was able to change the colour of one the duplicates by pressing "adjustment" > "recolour..." and it was recoloured to the brush colour which had been selected.
I thought I've found how to proceed, so I selected a new colour, and made a new "recolour...", but affinity change the stroke to the same colour as of my first "recolour...." even though a new colour was selected?

So, now I'm stuck again. How do I change colour of a pixel brush stroke?
(Is it just me or is affinity a little bit unintuitive (or illogical) in the way processes are put together?

Using 1.8.5.703

[R C-R 4,235]

What specifically do you mean by "made a new 'recolour...'"? Are you talking about the layer based (& non-destructive) Recolor Adjustment or something else?