Baking woes....

Need help from the experts out there.... i am sure something is wrong although the finished product was ok

After creaming the butter and sugar (as per the recipe), i was suppose to add in the egg.... but once the egg was added.... the batter kinda seperated... it doesnt look like it would bind no matter how much i beat it....

Is there something wrong? I dont remember the batter looking like this after adding eggs.... is it the butter? too much/not enough creaming? order of ingredient addition wrong? overbeating?

heeeeelp!!!