I had water leaks into the cabin on our 2006 22', just a few tablespoons but enough to worry me. It took a year to track it down. Water was coming in from the vent for the water tank which is on the port side just forward of the cabin bulkhead. The vent was improperly installed, no sealant, hand tight, hole drilled too high, etc. I'm not sure how to see that from the inside on one of the new molded interiors but if you can see the inside, look for obvious water marks coming down the cabin wall. I also ended up resealing the joint between the cabin rear bulkhead and the cockpit floor. I think you have a molded in flat floor in your cockpit but it's probably worth while to check that junction and seal anyplace that looks at all suspicious. I used 5200 as the sealant. You should also check the hoses from the water tank. There is a large fill hose at the top rear of the tank going up to the filler on the port side, a smaller one going to the aforementioned vent. Those are on the back of the water tank and hard to access unless you can get to the tank. There is a small one going from the front bottom of the tank over to the kitchenette sink and, in my boat a fourth going to the vertical plastic fill level indicator. Each of these hose has hose clamps that should be checked and if there is room, put a second clamp on each.
You might dry everything completely, put a little food coloring in the water tank, and after a couple of hours look for that coloring on the cabin floor. If you see it, you know the leak is from the water tank or the bottom hoses. If you don't see any water, spray a hose at the filler and vent area for a few minutes, then check your floor for water. If none, that should be eliminated. Then do the same thing in the cockpit, spray water at the bulkhead cockpit junction, no water inside: that is eliminated.
You said you water is under the dinette, that points to the water tank/tank components.
There should be zero water on the cabin floor.