Spot colours!

I have a file that uses Pantone 032 Red on some elements.

I have Pantone 032 Red in my Colour Styles docker.

If I select an element and double click the 032 swatch in the docker the colour fill reduces the colour percentage of the element down each time.

Does anyone know why this is happening and how to resolve it please?

It's only just started to happen!

Anyone got any ideas?

Thanks in advance