It's not likely, unless your cake burned up. Instead, check your ingredients, from flour, sugar, butter and/or shortening to eggs, spices, flavor extracts and whatever else you may be using. If they're not fresh and good, the color of the cake is the least of your problems. You could actually get sick if there's a spoiled ingredient. So look at the "best by" date on the packaging--if anything has passed that date, throw it away. Your family's health is too important to take chances.
It is not likely that your oven has to do with the browning of the cake. If the cakes are burnt up yet you set it right, then it is possible. However, you need to check your ingredients and the heat setting on your oven.