Hmmm, I am not sure I am understanding the problem. You turned the container over and it came out in one big chunk? That is what it is suppose to do. I take mine at that point (we call them brownies) and lay it on a tray and either cut chunks with a sharp knife or pick off chunks with my fingers. The little chunks are the "hos's" I plant out.

Soemtimes when you turn over a container the brownie doesn't stay in tact. That is why I always do the turning over a tray on my garden bench. If the soil starts breaking apart I can do some quick hand moves to get the pieces easily on the tray.

Not sure if this helps..
Nancy

Before you plant out, water the containers really well. I usually water mine about 15 to 30 minutes before I turn them upside down. It helps hold the soil together. If I have a container with really loose soil, I'll drop it about 4" onto the concrete after watering it to compact the soil a bit. Makes it easier to keep it together while trying to break it into parts to plant out.