Sometimes homemade whipped cream can go bad. This is why following the tips and directions can be a good idea. Deflated whipped cream can happen when the whipped cream loses air. To fix deflated whipped cream place the whipped cream into your refrigerator for about 15 minutes to help firm it up. Then re-whip the whipped cream on low speed. Over-Whipped Whipped Cream happens when you beat your whipped cream beyond the stiff peak stage and it becomes grainy or like butter. The easiest thing to do is to just start over using a clean bowl with clean whisk attachment. The over-whipped cream can be made into homemade butter if you are feeling ambitious however.