Will Jones

Before I begin I am very sorry if I have categorised this wrong I have gone into affinity photo version 1.10.5.1342 and when I have done to use the basic brush it is working as if there is a low opacity filter on it, I have tried messing with the settings and that did nothing, neither did resetting the brushes. It is probably some really simple fix but I do not know what to do so some help would be helpful