I painted our living room wall with Behr's Opera House red about 7 weeks ago. I washed the wall with TSP, primed it, and painted on two coats of Opera House red (Eggshell sheen). Yesterday I cleaned an area of the wall with a soft wet cloth. The rag turned red and now the section of wall looks duller and different from the rest. Is this a problem with Eggshell finishes or with the paint? Thanks.