I recently cut in and rolled out my family room and kitchen. I used the same paint from the same can for both and the can was made up the morning I got started. In other words, the can came out of the shaker at the store and went onto the walls the same day. I worked out of the can and it appeared to be evenly mixed. When I poured the paint into my tray, it looked as if it was blended well and all one color. When the paint began to dry, the cut in was lighter in shade than what was rolled out so as to appear like two different colors. There is a line all around the room where the roll out meets what was brushed in. What causes this and how do I fix it. The paint covered nicely in one coat.

Just to make sure I’m not way too high or too low, I would greatly appreciate some help with estimating a price for painting a 12x12 dining room with 8 ft ceilings. Walls and ceiling will be painted with two coats of flat latex (walls different color than ceiling). Baseboards will be painted with two coats satin latex enamel. Trim around 6x6 window will be painted with two coats satin latex enamel (steel sash not to be painted). There are no doors. Walls and ceiling are in good shape and should require average prep. Cost would be adjusted for the Philadelphia area and 6% sales tax. Thanks!!