Weird lines when applying the normal map on the rock texture

Hello everyone!
How can I fix the weird lines that appear on my rock texturing when applying the normal map?
Without normal:


With normal:

image
The geometry complexity is about 600 polygons.

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Show the full node set up please.

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Thank you very much for responding so quickly and for the help provided!
Here is the complete node setup:

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Ah you changed some bits, Linear to non colour, flat to box.
All looks like Grant’s, bar more use of blend on two of the image nodes.

The other thing he mentions as he has a ‘line’ effect too still is just lighting it more, if you went that far through the lecture. That seemed to fix it for him.

This is always a bit of a compromise and fudge to make the image mapped on look ok at the joins. Later methods shown in the course can do it better by painting onto the UV unwrap.

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