Check the gaskets where they adhere around the opening. I had leaks as well on my 2017 IKSS. The gasket material around the upper corners of the bunks was lifting away causing the leaks. I secured the gaskets back down using 3M Black Super Gasket and Weatherstrip Adhesive that I got from Amazon and this fixed my problem.
Steve, Barb, and 5 daughters who love to camp
2017 Shamrock 23IKSS, Yellow sticker: 5314 lbs, Equil-i-zer 4pt. 1,000/10,000
2006 Fleetwood (Coleman) Niagara: Sold!
2003 Suburban 1500 Z71, 5.3/3.73, airbags, LT tires, Big Brake Upgrade, Prodigy P2