how much puree did you put in against how many eggs and sugar?that should not have happened....the only thing i can think of is you put too much liquid puree in. should not be more than 1/4" cup plus two tablespoons per 5 egg whites/ 1...
i use this all the time...it works beautifully with fondant and modelling chocolate as well.you really don't need a former, it holds it shape pretty well when it comes out of the press (better with fondant than MC).diane