Hi Roger! Thank You for your purchase!
My funds are only counting one purchase, but if you have any issues, you need to contact Itch support and they'll refund the amount. I have no control over this, sorry.
Regarding the outline, I'm not sure I understood correctly, but I tested it on Windows 10 and it's working fine. I haven't tested it on macOS, but I believe it works the same way, as the code is the same, only the build changes.
In my tests, it always maintains the color and opacity of each part separately without any issues. There are two buttons to change the outline color. The first one in the top left is individual for each body part. The second one, just below, next to the "Outline" name, is general for all parts.
If you could give me more details about exactly when the outline returns to its previous color, I can try to reproduce it here. If you have any questions, please comment here.