The cam lock system was employed through 2008; the "Click N Go" system begun with the inflatables (2008?); the rest of the Mirage Drive kayaks began using a modified version of this at the beginning of the 2009 model year. This then is what you have.
I've personally not experienced any leaks on this system, but if you have a leak, you may have a hairline crack that opens up under the stress of using the Drive. A careful examination with a mirror and light may reveal such a crack looking inside the hull, perhaps emanating from one of the screw down points.
You can also remove the suspect C&G unit with an allenhead wrench and have the exact leak location revealed with the bubble test. Take pics to document this and file a warranty claim with Hobie (through your local dealer), even the boat is out of warranty. If the Company offers a reasonable replacement hull cost, that would be great!
If not, you may be able to arrest and seal the crack from the interior using the 3M DP 8010 epoxy or mentioned in the link above or Loctite 3030. They both have excellent adhesion to PE and should be able to seal the leak and reinforce the plastic. There is a stiffer version of the 3M product called DP 8010 NS that has more body -- may be best for this type of repair.
First you need to pinpoint the crack (if you have one) and have interior access to it via the rear cockpit 8" hatch.,
Let us know what happens!