HAVE A NON FISH REALTED QUESTION.

I JUST PICKED UP A USED TWO PERSON PADDLEBOAT (AQUAMATE). WHEN I PUT IT IN THE WATER IT WAS FAIRLY LIGHT . WHEN I TOOK IT OUT 3 DAYS LATER IT WAS HEAVIER AND HAD SOME WATER IN BETWEEN THE BOTTOM THAT SITS IN THE WATER AND THE SHELL THAT YOU ACTUALLY SIT ON. I NOTICED THERE ARE 2 HOLES IN THE FRONT AT THE TOP. DOES ANYONE KNOW IF PADDLEBOAT NORMALL GET WATER INBTEEWN THE TWO HALFS? I HOPE I AM EXPLAINING THIS RIGHT.