I think the problem is caused by having your UVs split on that edge loop.
Possible solutions.
1. Move the verts on that edge loop so that they either fit entirely within those rings, or outside of them. That way the rings will bake onto one UV island or the other not both at the same time.
2. Split your UVs two loops lower down the cylinder rather than at the top.
3. Bake with xNormal using a projection cage rather than the raycast method.
Replies
Possible solutions.
1. Move the verts on that edge loop so that they either fit entirely within those rings, or outside of them. That way the rings will bake onto one UV island or the other not both at the same time.
2. Split your UVs two loops lower down the cylinder rather than at the top.
3. Bake with xNormal using a projection cage rather than the raycast method.
Hope that helps.