OK, I created simple mushroom model in Blender 2.8 and exported that file to OBJ. Now I trying to add some decal on my model, and don't know why blender is repeating that decal. I puting it on mushrooms body, but DN puting it also on it's hat 
Anyone know where is the problem? Render preview and final render PNG file below.
because your map is doubled up and tells Dimension that the hat and body use the same area
imo the best fix is to select part of the mushroom with the magic wand tool and then place a new texture | decal on only that part of the model
p.s, a trick to using the magic wand is to first scale the model up i.e, bigger... a very small model will tend to select everything with the wand but if you make it bigger you can select | edit the part you need then just scale it back to the correct size after
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