The last DDS file you attached is different from those in your earlier post. I am not too familiar with graphics but I did notice the ALPHA channel in your earlier post was showing as a white field only with no lettering visible. The last DDS you posted you can see the word LOGO in white letters on a black background when you view the ALPHA . I believe , with my limited knowledge, that white in the ALPHA channel will display as black on-screen.
DXTBMP is a free program you can download from flightsim.com. If you run it you will clearly see what I am trying to explain. Good luck