Treasure map leading to non-existent treasure

I have run across various treasure maps that the X points to a non-existent treasure. Attached are screenshots of a treasure map which I dug an incredible amount of area and could not find the treasure. Eventually I went on a cheat website called chunkbase, entered my seed and found a treasure almost 200 x coordinates away exactly where the tool said it would be. The spot marked with the X on the map has no treasure according to the site. I have tried close to 10 treasure maps and have only been successful with about 3 or 4 on the same seed.