The lid of the keg just might not have seated right to give it a good seal.
I usually hit my kegs with a bit of gas after filling them to make sure the lid seals. You might also use keg lube.
Secondary 1 - Hibiscus Saison
Secondary 2 -
Secondary 3 - Malkore's Not So Ancient Orange Mead(2.5 gal)
Secondary 4 -
Gallon Fermentor - Joe's Ancient Orange, Joe's Quick Grape Mead, Pomegranate Mead
Bottled/aging - Sunshine Wheat Clone, Fat Tire Clone, Hard Cider, Scotch Ale, Orange Blossom Sweet Mead
Coming soon... - Weizenbock, Belgian Wit, Apfelwein