This is normal. When agar jelly is uncontained, water will slowly seep out because it's an unstable gel. A small amount of water loss will not affect the taste or texture, so if it has to sit for a couple of hours unmolded that's fine. But the best practice is to cut or unmold it close to serving time. If you want to give it away to people, I recommend making it in a container you're willing to part with and give it to them in the mold.