I only had two Tau logos like the one you see in the picture, so I was extra careful with the 2nd one; same thing happened. You can see that the decal separated in a major way, also around white/black edges..
I tried a different part of the sheet, but to no avail. Then I tried a 2nd sheet, but same thing happened. The sheets were old, from when the Tau came out. My buddy Christian had found them and donated them to the Tau cause. It seems they are too old? I have never heard of that before and on Google I couldn't find anything about it? Any thoughts?