Air Dryer Blowing its Top

[Jaws]

So I took my silica beads out of my air dryer to cook them. No problem. Then I hooked it back up and the air pressure keeps blowing the lid off. I hooked up the air pump to each thing individually to see if there was a blockage somewhere. Everything worked fine individually but as a series, "POP". What the heck could be going on? Anyone else have this problem?