We had a similar problem a while back. The problem was that we weren’t connected correctly to our page. Add yourself as an administrator of your cake page and then it will allow you to be either personal page or your cake page. What we did was while on our personal page,” like” your cake page. Then go in to your likes from your cake page and make yourself an administrator. This should link the two up and allow you to use either one by clicking down from right and it will say use as “whatever your name is” or use as ” your cake page” Then when you comment you pick which one you want to use.