baron sportsman water tight compartments

Hi guys, was wondering if any of you can help, i have a baron sportsman and i can see there are 3 water tight compartments, 2 each side and the middle 1,i wasnt shown the middle 1, 

when i bought it was told to take out the bungs now and then to let it air, was only shown the outside 2 then i noticed the middle 1 had no bung in it so i put 1 in,

after a while i took all 3 out and the middle 1 had water coming out,a fair bit mind,  there should be no water in these compartments? i can see no holes in the hull, then it rained last night , i wound the jockey wheel up and more water came out so if its getting in from the top of the boat could anyone with a baron have a clue where its getting in any info would be much appreciated,