When you calculate the analysis ‘Analysis sows – Dead suckling piglets’ the colours are linked to the row number in the setup. (Not the cause)

If you look at the ‘Data presentation’ in the left side of the window the top line always have the same colour. 

When you choose TOP3, TOP5 or TOP10, then the colours changes according to which cause is the most frequent.

If you set ‘Causes to show’ to Manuel and choose which causes to show, then you link the cause to the colour.