I use the brush, I click on a colour and it goes grey for some reason all the time I click on a colour. Eg; blue. Anyone know why?

I use the brush, I click on a colour and it goes grey for some reason all the time I click on a colour. Eg; blue. Anyone know why?
Image >> Mode >> RGB Colour
greyscale was automatically switched on for some reason. thanks.
Oh ok thanks.
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