Hi, Richard,
thanks a lot for replying so quickly 🙂 I really appreciate it!
I’m not able to check it this weekend, as the Photoshop I have at home is working “correctly”, is the one at work that is giving me those weird problems, but I will check what you suggest and come back to you!
I hope I am working on indexed colour mode, as you suggest 😉
Thank you again, have a great weekend!