Just had a problem with one of the vortex when I was filling it. Half filled it and put the cap back on to do something else. When I took the cap off to put in more juice in, some bubbles came up from around the side and a bunch of juice came out the center hole. Looked for some cracks, couldn't find any. Put the cap back on and retried again, same thing happened. Tried a different Vortex and nothing happen - worked like normal. The one that is leaking has the little felt pad wrapping taken out. Just took it apart again can't see anything different from the other ones. Filled it with water and the water just ran straight out. ANY IDEAS on what is happening??