I don’t see any major problems here – it sounds like you have a small hole that needs to be plugged with seam sealer. Try to remove any foreign objects that might prevent the sealant from filling the gap between the fabric layers (I’m not sure what that white stuff is) and then apply more Seam Grip/Aquaseal on the spot that is leaking and the surrounding area. Try to force it into the hole (with the Seam Grip brush bristles or something similar) for good measure. If it still leaks after one coat, simply apply more.