The muffins can get soggy if they sit in the muffin pan too long after baking. Condensation from the cooling muffins can form inside the muffin liners and leak into the bottoms. Make sure to remove the muffins from the pan as soon as they are cool enough to handle with your hands. Almond flour is already super soft, so it can easily become soggy if too much liquid is used in a recipe. This is why tahini/nut butter is used as the fat source instead of butter or oil.