Dragging in the Layers panel to reposition a layer below a Layer Group can give different results than expected. In the example below, dragging and dropping the texture layer below the Cactus Layer Group, results in the texture layer being added to the Layer Group (inside of it, instead of below it).
Learning to reposition your layer stacking order, can save you time and ultimately you'll find what your looking for. For some reason we never think to do this but this easy tutorial will go in-depth, basically just showing you which layers should go after or before, one another.