So twice now (that I know of) I have had tattoos show be collected differently than other people have said they should be.
The first I encountered was the Vidarr head tattoo, which I have no idea where I got, but it absolutely wasn't from the Sciropescire treasure map that websites say it came from. In fact, I still have the map, and when I go to the location, I can loot the treasure but am given nothing. Unfortunately, I wasn't keeping notes at the time and I have no idea where I got the tattoo design from, though I do remember buying a bunch of them from the in-game shop not long before.
The second one was the Cross Face head tattoo, and at the time I had been recording sources and noted that I purchased it from the in-game store for silver. In this case, I have the map, but when I go to the treasure location, I can't interact with it at all. I initially reported this in this topic before I realized that was the issue.
In both cases, I am 100% positive I did not loot either treasure map location previously.