There are two possible reasons for your problem regarding the baking of your Kitke. The first is that you might be baking at too high a temp and will have to lower the temperature somewhat. Also it might be that your oven's calibration is off. You might want to buy an oven thermometer and check if you're getting the proper temp. I would love to get your Kitke recipe. By the way, for those who do not know what Kitke is, it is a South African type of Challah. I believe the word Kitke originated in Lithuania. Awaiting your recipe.