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From what I know of this plant, a golden/bronze color is idicative of too much light, too little water or both. This plant is healthy and happy as a full green color. Some of the species have white accents throughout the green, but I am not aware of a philo. that is brown and healthy. It looks from your picture that your species is supposed to be a solid waxy green.
It is not unusual for Philodendron hederaceum to lose some of the characteristics that were noticed when you acquired the plant. Within a few seasons of growth, this philodendron may change its leaf color as well as its texture. Some that are purchased for their velvety leaves lose their velvety texture, and some that were purchased for their bronze-colored leaves lose their "bronziness." It's a characteristic noticed in Philodendrons and other aroids.