Hi! I am new to piping icing and have made homemade buttercream with the right consistency. When I first start piping it turns out great! However, after I put new icing in the piping bag and re pipe, it looks not as firm and soft looking. When I see this, I put the piping bag and frosting in the fridge for a bit but it still comes out looking soft again. What do I do to fix this? Is it because I’m putting frosting in the same piping bag as the last and it’s making it get soft somehow? Do I need to use a new bag? Do I need to re whip the frosting? Take it out of the piping bag and let it sit in the fridge for an hour? It’s just very weird because when I went to repipe and refilled the piping bag, it had only been minutes since I filled the piping bag the first time.