No, definitely not. jpg compression makes it worse, which is why most people use targas or pngs for textures. Putting edge-padding into your normal map bakes will also help prevent seams. Clonestamping is a very very bad idea. When you plug your normal map into your diffuse channel it is completely normal that you will see…
There is a seam when you plug your normal map into the diffuse channel. That's completely normal (no pun intended). Is there an issue when you're actually using your normal map AS a normal map? I just applied your normal map to your model in marmoset, and didn't see any issues, so I'm gonna assume that everything is fine.…