Studio output not at 100% opacity after going back to Photoshop

So if I’m using Topaz studio to as a photoshop plugin, I always duplicate the layer first, and then make my Topaz adjustments on the duplicated layer.

When I do this, the layer is at 100% opacity. Once I’ve done my adjustments in topaz and clicked accept, to go back to Photoshop. The layer says it’s at 100% opacity, but if I disable all the layers below it, I find that the Topaz layer is slightly transparent. (Meaning I can faintly see the checkerboard background through it).

Then, to get to full opacity I have to duplicate the layer again and merge the two layers together. Which is an extra step that I would like to not have to do.

Has anyone else had this problem, or does anyone know how to fix it?