Did you level your layers? If they are not level then the top layer is going to split. The bottom layer will split also if the dome is top down.
Thank you for your reply. I cannot claim they are level. Every time I pick up the second layer to lay it on top of the first layer I have this problem. I'm making a practice cake over the weekend and I will make sure it is very level. Thanks again for your help, I appreciate it so much.
Thank you for your reply. I cannot claim they are level. Every time I pick up the second layer to lay it on top of the first layer I have this problem. I'm making a practice cake over the weekend and I will make sure it is very level. Thanks again for your help, I appreciate it so much.
have you tried using a cake lifter, the other way of doing it is to slide it on a spare cake board first then slide it off on top of the other layer. keeps it supported so it doesn't split while layering one on top of the other
I spent the little bit of money on the cake lifter and it saved me a lot of aggravation! If you don't have a cake lifter, or cake board, you can always just grab your spouse (or anyone else you can find!) and have them give you a hand. My cake lifter replaced my husband 
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