Can anyone answer my problem. l have just painted my front room with matt trade emulsion- wickes brand 10 litre tub.This was done after using lining paper on the walls.Anyway l have cut in one wall at a time before using the roller on it.But when it's dry where l have cut in it's darker from where l have used the paint brush . l have used a light colour of barley white. l have tried rolling first then cutting in but still have a light/dark contrast where the roller has met the brush.l have used a symthetic brush and smooth roller, so why is this happening.l have gave it 3 coats and it's still there.Also where l have cut in ' from a angle it has a shine all round where l have cut in.Answers much appreciated.